Expressing "each other" with "bici"

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彼此，人称代词。彼(bǐ)是“那"，此(cǐ)是“这”，彼此(bǐcǐ)的意思是“那个和这个”或者“你和我”。

Basic Usage

作为人称代词，“彼此”常用作主语、宾语。做宾语时，动词必须是双音节且比较正式的。

彼此 + Verb

Verb + 彼此

我们只见过一次，彼此不是很了解。We've only met once. We haven't known each other much.
我们是一个团队，彼此应该多沟通。We're a team. We should communicate more.
我很尊重我的对手，我希望彼此都能有好的表现。I respect my opponent very much. I hope we both can play our best.
我们是一家人，必须好好照顾彼此。We're family. We must look after each other very well.
好朋友总是会陪伴彼此。Best friends will always be there for each other.
你们是夫妻，怎么一点也不信任彼此？You're husband and wife. How can you not trust each other at all?

有时也可以用作定语，被修饰名词的意义通常都比较抽象。

彼此 + 的 + Noun

A few examples:

过去一年，我们见证了彼此的进步。 each other.
大家都很辛苦，我们需要尊重彼此的努力。To respect each other.
我们十年没见了，对彼此的生活都不了解，也很惊讶彼此的变化。It's been ten years since we met last time. We don't really know each other's life and we are very surprised about each other's change.

在口语中，“彼此“可以重叠为“彼此彼此”，是一种客套话，意思是“大家都一样，我们差不多”。