英语语法分析

Not a comma was left out.

一个逗号都没遗漏。

《新英汉大辞典》

The two clauses are separated by a comma.

这两个分句由一个逗号分开。

You can actually initialize multiple things at once by separating them with a comma, and this is sometimes helpful.

实际上，您可以通过用逗号分隔多个事物来一次初始化它们，有时这很有帮助。