副词

介词

结婚纪念日

锻炼

结婚纪念日

方位;移动（POSITION OR MOVEMENT）

In addition to the uses shown below, in is used after some verbs, nouns, and adjectives in order to introduce extra information. In is also used with verbs of movement such as ‘walk’ and ‘push’, and in phrasal verbs such as ‘give in’ and ‘dig in’.
除下列用法外，in还用在一些动词、名词、形容词后面，以引出附加信息。in 还与表示动作的动词连用，如 walk，push等,还用在诸如 give in，dig in 等短语动词中。

1. a unit of length equal to one twelfth of a foot

Synonym: inch