操作：LESS和Sass都支持简单的算术操作，例如加法。将这个特性和变量结合起来，会使得CSS变得更加灵活。

Operations: both LESS and Sass allow for simple arithmetic operations such as adding values, which becomes useful with variables to make CSS files more flexible.

youdao

操作：LESS和Sass都支持简单的算术操作，例如加法。将这个特性和变量结合起来，会使得CSS变得更加灵活。

Operations: both LESS and Sass allow for simple arithmetic operations such as adding values, which becomes useful with variables to make CSS files more flexible.

youdao