[外语] 三星笔试题目请教

引用:

原帖由 Wini妈妈 于 2010-2-12 23:10 发表
Pollution is a big problem in big cities like Beijing, Shanghai and Guangzhou.
Pollution is a big problem in big cities, such as Beijing, Shanghai and Guangzhou.

看出差别来了么？such as前需要逗号。 ...