\begin{align}
& nH_{2}O + ^* \rightarrow H_{2}O^*_{n}
& mH_{2}O + ^* \rightarrow H_{2}O^*_{m-1} + H_{2}O
\end{align}
上面的方法有效，但我想去掉斜体的等式。所以我做了以下事情
\begin{align}
\mathrm{
& nH_{2}O + ^* \rightarrow H_{2}O^*_{n}
& mH_{2}O + ^* \rightarrow H_{2}O^*_{m-1} + H_{2}O
}
\end{align}
它给了我“缺少}插入”错误:(
答案1
您需要另一个\mathrm：
\begin{align}
& \mathrm{nH_{2}O + ^* \rightarrow H_{2}O^*_{n}
}
&\mathrm{ mH_{2}O + ^* \rightarrow H_{2}O^*_{m-1} + H_{2}O
}
\end{align}
一切都应在开幕之前&（或等等）关闭 。\\{