comma

Don't forget to put a comma after the introductory phrase in your formal essay.

(Chinese) 在正式论文的引导句后，别忘了加一个逗号。

In the list 'apples, oranges, and pears,' the comma helps separate the different items.

(Chinese) 在“苹果、橙子和梨”这个列表中，逗号帮助分隔不同的项目。