diff --git a/level/index.html b/level/index.html
index 66fddbc..abb68bf 100644
--- a/level/index.html
+++ b/level/index.html
@@ -174,7 +174,7 @@ <h1 class="menu-title">Sokoban Tutorial</h1>
                 <div id="content" class="content">
                     <main>
                         <h1 id="关卡"><a class="header" href="#关卡">关卡</a></h1>
-<p>推箱子关卡使用最广泛的格式为 XSB, 最初由 XSokoban 所使用. 该格式使用 ASCII 字符来表示地图元素, 支持注释和附加元数据.<br />
+<p>推箱子关卡使用最广泛的格式为 XSB, 最初由 XSokoban 所使用. 该格式使用 ASCII 字符来表示地图元素, 并支持注释和附加元数据.<br />
 以关卡 <code>Boxworld #1</code> 为例:</p>
 <img src="../assets/boxworld_1.png" alt="Boxworld #1" width="70%" style="display: block; margin: 0 auto"/>
 <p>其 XSB 格式关卡的数据如下:</p>
@@ -206,7 +206,7 @@ <h1 id="关卡"><a class="header" href="#关卡">关卡</a></h1>
 </tbody></table>
 </div>
 <h2 id="表示地图"><a class="header" href="#表示地图">表示地图</a></h2>
-<p>地图共包含 5 种元素, 其中部分元素可能叠加(比如玩家位于目标上). 因此可以使用比特位来表示地图中的每个格子包含哪些元素.
+<p>地图共包含 5 种元素, 这些元素可能在一个格子内叠加(比如玩家位于目标上). 因此可以使用比特位来表示地图中的每个格子包含哪些元素.
 创建用于表示地图元素的比特位:</p>
 <pre><code class="language-rs">use bitflags::bitflags;
 
@@ -220,7 +220,7 @@ <h2 id="表示地图"><a class="header" href="#表示地图">表示地图</a></h
     }
 }
 </code></pre>
-<p>使用一维数组来存储地图数据并使用二维向量存储地图尺寸.</p>
+<p>使用一维数组来存储地图数据, 使用二维向量(数学)存储地图尺寸.</p>
 <pre><code class="language-rs">use nalgebra::Vector2;
 
 pub struct Map {
@@ -229,7 +229,7 @@ <h2 id="表示地图"><a class="header" href="#表示地图">表示地图</a></h
     // ... SKIP ...
 }
 </code></pre>
-<p>使用一维数组而非二维数组是因为一维数组更平坦, 进行部分操作时更简单高效:</p>
+<p>使用一维数组而非二维数组是因为一维数组更平坦(flatten), 进行部分操作时更简单高效:</p>
 <pre><code class="language-rs">impl Map {
     pub fn with_dimensions(dimensions: Vector2&lt;i32&gt;) -&gt; Self {
         Self {
@@ -241,6 +241,8 @@ <h2 id="表示地图"><a class="header" href="#表示地图">表示地图</a></h
     // ... SKIP ...
 }
 </code></pre>
+<p>因为只需要操作一个数组(而非 n 个数组), 进行调整地图尺寸等操作的代码会更简单高效.
+而且能确保动态数组的元素是紧密排列的, 根据数据局部性原理, 读取数据的性能通常会更好.</p>
 <h2 id="表示关卡"><a class="header" href="#表示关卡">表示关卡</a></h2>
 <p>关卡数据可分为三个部分: 地图数据, 元数据和注释. 其中注释可以作为元数据.<br />
 元数据是一个键值对的集合, 因此可以使用 HashMap 来存储.
diff --git a/level/normalization.html b/level/normalization.html
index 1a33aeb..c8f445c 100644
--- a/level/normalization.html
+++ b/level/normalization.html
@@ -211,7 +211,7 @@ <h1 id="标准化"><a class="header" href="#标准化">标准化</a></h1>
 <li>
 <p>对旋转和翻转进行标准化.</p>
 <p>将经过不同旋转和翻转的关卡标准化为同一个关卡.
-一个简单的方法是对不同旋转和翻转的地图求哈希值, 然后选择哈希值最小的地图.</p>
+一个简单的方法是计算不同旋转和翻转后地图的哈希值，选择哈希值最小的版本.</p>
 </li>
 <li>
 <p>玩家初始位置标准化.</p>
diff --git a/print.html b/print.html
index e305e53..0aa8af8 100644
--- a/print.html
+++ b/print.html
@@ -185,7 +185,7 @@ <h1 id="介绍"><a class="header" href="#介绍">介绍</a></h1>
 </ul>
 <p>本文将由浅入深的介绍上面功能并提供实现的思路.</p>
 <div style="break-before: page; page-break-before: always;"></div><h1 id="关卡"><a class="header" href="#关卡">关卡</a></h1>
-<p>推箱子关卡使用最广泛的格式为 XSB, 最初由 XSokoban 所使用. 该格式使用 ASCII 字符来表示地图元素, 支持注释和附加元数据.<br />
+<p>推箱子关卡使用最广泛的格式为 XSB, 最初由 XSokoban 所使用. 该格式使用 ASCII 字符来表示地图元素, 并支持注释和附加元数据.<br />
 以关卡 <code>Boxworld #1</code> 为例:</p>
 <img src="level/../assets/boxworld_1.png" alt="Boxworld #1" width="70%" style="display: block; margin: 0 auto"/>
 <p>其 XSB 格式关卡的数据如下:</p>
@@ -217,7 +217,7 @@ <h1 id="介绍"><a class="header" href="#介绍">介绍</a></h1>
 </tbody></table>
 </div>
 <h2 id="表示地图"><a class="header" href="#表示地图">表示地图</a></h2>
-<p>地图共包含 5 种元素, 其中部分元素可能叠加(比如玩家位于目标上). 因此可以使用比特位来表示地图中的每个格子包含哪些元素.
+<p>地图共包含 5 种元素, 这些元素可能在一个格子内叠加(比如玩家位于目标上). 因此可以使用比特位来表示地图中的每个格子包含哪些元素.
 创建用于表示地图元素的比特位:</p>
 <pre><code class="language-rs">use bitflags::bitflags;
 
@@ -231,7 +231,7 @@ <h2 id="表示地图"><a class="header" href="#表示地图">表示地图</a></h
     }
 }
 </code></pre>
-<p>使用一维数组来存储地图数据并使用二维向量存储地图尺寸.</p>
+<p>使用一维数组来存储地图数据, 使用二维向量(数学)存储地图尺寸.</p>
 <pre><code class="language-rs">use nalgebra::Vector2;
 
 pub struct Map {
@@ -240,7 +240,7 @@ <h2 id="表示地图"><a class="header" href="#表示地图">表示地图</a></h
     // ... SKIP ...
 }
 </code></pre>
-<p>使用一维数组而非二维数组是因为一维数组更平坦, 进行部分操作时更简单高效:</p>
+<p>使用一维数组而非二维数组是因为一维数组更平坦(flatten), 进行部分操作时更简单高效:</p>
 <pre><code class="language-rs">impl Map {
     pub fn with_dimensions(dimensions: Vector2&lt;i32&gt;) -&gt; Self {
         Self {
@@ -252,6 +252,8 @@ <h2 id="表示地图"><a class="header" href="#表示地图">表示地图</a></h
     // ... SKIP ...
 }
 </code></pre>
+<p>因为只需要操作一个数组(而非 n 个数组), 进行调整地图尺寸等操作的代码会更简单高效.
+而且能确保动态数组的元素是紧密排列的, 根据数据局部性原理, 读取数据的性能通常会更好.</p>
 <h2 id="表示关卡"><a class="header" href="#表示关卡">表示关卡</a></h2>
 <p>关卡数据可分为三个部分: 地图数据, 元数据和注释. 其中注释可以作为元数据.<br />
 元数据是一个键值对的集合, 因此可以使用 HashMap 来存储.
@@ -323,7 +325,7 @@ <h2 id="从解决方案构建关卡"><a class="header" href="#从解决方案构
 <li>
 <p>对旋转和翻转进行标准化.</p>
 <p>将经过不同旋转和翻转的关卡标准化为同一个关卡.
-一个简单的方法是对不同旋转和翻转的地图求哈希值, 然后选择哈希值最小的地图.</p>
+一个简单的方法是计算不同旋转和翻转后地图的哈希值，选择哈希值最小的版本.</p>
 </li>
 <li>
 <p>玩家初始位置标准化.</p>
diff --git a/searchindex.js b/searchindex.js
index 68eaf5d..7ee47c4 100644
--- a/searchindex.js
+++ b/searchindex.js
@@ -1 +1 @@
-Object.assign(window.search, {"doc_urls":["introduction.html#介绍","level/index.html#关卡","level/index.html#表示地图","level/index.html#表示关卡","level/index.html#行程编码run-length-encoding","level/parse.html#解析","level/parse.html#单个关卡解析","level/parse.html#多个关卡解析","level/parse.html#从解决方案构建关卡","level/normalization.html#标准化","level/normalization.html#激进的标准化","glossary.html#术语表"],"index":{"documentStore":{"docInfo":{"0":{"body":1,"breadcrumbs":0,"title":0},"1":{"body":38,"breadcrumbs":0,"title":0},"10":{"body":0,"breadcrumbs":0,"title":0},"11":{"body":2,"breadcrumbs":0,"title":0},"2":{"body":54,"breadcrumbs":0,"title":0},"3":{"body":10,"breadcrumbs":0,"title":0},"4":{"body":12,"breadcrumbs":3,"title":3},"5":{"body":0,"breadcrumbs":0,"title":0},"6":{"body":0,"breadcrumbs":0,"title":0},"7":{"body":0,"breadcrumbs":0,"title":0},"8":{"body":0,"breadcrumbs":0,"title":0},"9":{"body":2,"breadcrumbs":0,"title":0}},"docs":{"0":{"body":"本文将描述如何实现一个推箱子游戏, 代码示例使用 Rust 语言编写. 推箱子游戏具有以下特点: 规则简单. 可以专注于实现功能, 而非理解复杂的游戏规则和机制. 基本功能易于实现. 有具有挑战的高级功能. 比如纯鼠标控制(也称为点推), 逆推等. 有需要深入钻研的求解器, 用于自动求解推箱子关卡. 本文将由浅入深的介绍上面功能并提供实现的思路.","breadcrumbs":"介绍 » 介绍","id":"0","title":"介绍"},"1":{"body":"推箱子关卡使用最广泛的格式为 XSB, 最初由 XSokoban 所使用. 该格式使用 ASCII 字符来表示地图元素, 支持注释和附加元数据. 以关卡 Boxworld #1 为例: 其 XSB 格式关卡的数据如下: ;Level 1\n__###___\n__#.#___\n__#-####\n###$-$.#\n#.-$@###\n####$#__\n___#.#__\n___###__\nTitle: Boxworld 1\nAuthor: Thinking Rabbit 第 1 行, 以 ; 开头的单行注释. 第 2-9 行, 使用 ASCII 字符表示的地图数据. 第 10-11 行, 包括关卡标题和作者的元数据. ASCII 符号 描述 <SPACE>/-/_ Floor # Wall $ Box . Goal @ Player + Player on goal * Box on goal","breadcrumbs":"关卡 » 关卡","id":"1","title":"关卡"},"10":{"body":"激进的标准化可能改变关卡的解. 以最简单的关卡为例: #####\n#@$.#\n##### 因为玩家开始的位置三面有墙, 位于死胡同, 只能向右移动. 得到结果: #####\n# @*#\n##### 玩家左侧死胡同属于无用的区域, 使用墙体填充. 玩家右侧位于目标上的箱子处于死锁状态, 属于无用的箱子和目标, 使用墙体填充. 最后去除多余的墙体得到激进的标准化结果: ###\n#@#\n### 这是一个最简单的非标准关卡, 因为其没有箱子和目标, 解为空.","breadcrumbs":"关卡 » 标准化 » 激进的标准化","id":"10","title":"激进的标准化"},"11":{"body":"中文 英文 求解器 Solver 解/解决方案 Solution","breadcrumbs":"术语表 » 术语表","id":"11","title":"术语表"},"2":{"body":"地图共包含 5 种元素, 其中部分元素可能叠加(比如玩家位于目标上). 因此可以使用比特位来表示地图中的每个格子包含哪些元素. 创建用于表示地图元素的比特位: use bitflags::bitflags; bitflags! { pub struct Tiles: u8 { const Floor = 1 << 0; const Wall = 1 << 1; const Box = 1 << 2; const Goal = 1 << 3; const Player = 1 << 4; }\n} 使用一维数组来存储地图数据并使用二维向量存储地图尺寸. use nalgebra::Vector2; pub struct Map { data: Vec<Tiles>, dimensions: Vector2<i32>, // ... SKIP ...\n} 使用一维数组而非二维数组是因为一维数组更平坦, 进行部分操作时更简单高效: impl Map { pub fn with_dimensions(dimensions: Vector2<i32>) -> Self { Self { data: vec![Tiles::empty(); (dimensions.x * dimensions.y) as usize], dimensions, // ... SKIP ... } } // ... SKIP ...\n}","breadcrumbs":"关卡 » 表示地图","id":"2","title":"表示地图"},"3":{"body":"关卡数据可分为三个部分: 地图数据, 元数据和注释. 其中注释可以作为元数据. 元数据是一个键值对的集合, 因此可以使用 HashMap 来存储. 可以使用下面的结构体存储关卡数据: pub struct Level { map: Map, metadata: HashMap<String, String>, // ... SKIP ...\n}","breadcrumbs":"关卡 » 表示关卡","id":"3","title":"表示关卡"},"4":{"body":"行程编码(Run length encoding, RLE)经常被用于压缩推箱子的关卡和解决方案. ###\n#.###\n#*$ #\n# @ #\n##### 经 RLE 编码后可得: 3#\n#.3#\n#*$-#\n#--@#\n5# 可以看出, 虽然编码后的关卡有更小的体积, 但不再能直观地看出关卡的结构. 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