如何在LaTeX的align环境中为每行公式末尾添加逗号？

直接在每个公式行的末尾（换行命令\\之前）添加逗号即可，修改后的代码如下：

\begin{align}
\frac{\partial h}{\partial t}+\frac{\partial(uh)}{\partial x}+\frac{\partial (vh)}{\partial y}&= e_wU -V_s, \\
\frac{\partial (uh)}{\partial t} + \frac{\partial (u^2h+\frac{g'}{2}h^2)}{\partial x}+\frac{\partial (uvh)}{\partial y} &= +g'hS_x-\frac{\tau_{b_x}}{\rho_{eau}}+f_{corr}hv, \\
\frac{\partial (vh)}{\partial t} + \frac{\partial (v^2h+\frac{g'}{2}h^2)}{\partial y}+\frac{\partial (uvh)}{\partial x} &= +g'hS_y-\frac{\tau_{b_y}}{\rho_{eau}}-f_{corr}hu, \\
\frac{\partial (C_ih)}{\partial t} + \frac{\partial (uC_ih)}{\partial x}+\frac{\partial (vC_ih)}{\partial y} &= E_i-D_i,\\
(1-\varphi)\frac{\partial \eta}{\partial t} &= D_{tot}-E_{tot},
\end{align}

操作要点：

• 逗号需放在等号右侧表达式的末尾、换行命令\\之前
• 保持原align环境的对齐符号&位置不变，不影响方程组的对齐效果

内容的提问来源于stack exchange，提问作者L Maxime