preposition, verb, measure word · by means of; through the medium or agency of

我们通过电子邮件联系。

verb, preposition · to be officially adopted or approved (such as legislation), or to succeed in an examination

他顺利通过了驾驶考试。

verb, preposition · to go or move through a physical space or location

行人通过马路要走人行横道。