conjunction, preposition, idiom, directional, punctuation · so as to; used to express purpose or intention

我们要努力学习，以报效祖国。

preposition, verb, noun, expression, idiom, conjunction, adjective · to use or employ something as a tool or means

他试图以道理说服固执的对方。

preposition · based on or in accordance with a principle or standard

我们应当以法律为准绳处理此事。

preposition · due to; by reason of

他以身体不适为由拒绝了邀请。

abbreviation · abbreviation for Israel (以色列 Yǐ​sè​liè)

以巴冲突已持续多年。