英语缩写：i.e.、e.g.、etc.
i.e. and e.g. are both abbreviations for Latin terms.
i.e.和e.g.都是拉丁语缩写。
i.e. stands for id est and means roughly "in other words."
i.e.代表id est，意为“也就是说，即”（that is），
e.g. stands for exempli gratia, which means “for example.”
e.g.代表exempli gratia，意思是“举个例子”（for example）。
etc. is easy to understand, which stands for “and so on”
etc.就很好理解，相当于and so on
