> For the complete documentation index, see [llms.txt](https://overleaf-pro.ayaka.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://overleaf-pro.ayaka.space/latex/zh-tw/geng-duo-zhu-ti/09-commands-and-environments.md).

# 指令與環境

## 命令

LaTeX 文件的行為可以透過使用特定指令來控制。典型的指令結構如下：

```
\commandname[optional argument]{main argument}
```

請注意，所有指令 **必須** 都必須以反斜線開頭，而主要參數必須包含在 {..} 括號對中。

有些指令有不只一個參數，例如：

```
\multicolumn{number of columns joined}{alignment}{content}
```

有些指令不需要 {} 括號對也能正常運作，例如：

```
\item 項目內容文字
```

有些指令有可選參數，例如：

```
\item[--] 項目內容文字
\\[2ex]
```

## 環境

一種特殊類型的指令是環境。典型的環境結構如下：

```
\begin{environmentname}
 內容
\end{environmentname}
```

例如：

```latex
\begin{center}
範例文字
\end{center}
```

或

```latex
\begin{enumerate}
\item 第一點
\item 第二點
\end{enumerate}
```

請注意，所有環境 **必須** 都以 \begin{environmentname} 開始，並以 \end{environmentname} 結束。

有些環境像指令一樣，也會接受參數與可選參數。例如

```latex
\begin{tabular}[table position]{column specifications}
 表格內容
\end{tabular}
```


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