swim in the river

在河里游泳

sit in an armchair

坐在扶手椅上

in (the) winter

在冬季

In doing we learn.

边做边学。

The concert will begin in an hour from now.

音乐会在一个小时后开始。

He is (dressed) in green.

他穿着绿衣服。

a man in glasses

戴眼镜的男子

live in peace

过着平静的生活

in good condition

状态/状况好

arrange in alphabetic order

按字母顺序安排

The children sat in a circle.

孩子们坐成一圈。

He's weak in maths.

他数学不好。

The table is two metres in length and one metre in width.

这张桌子长两米、宽一米。

Write in ink / pencil.

用墨水/铅笔写。

in cash

用现金

She opened the door and went in.

她打开门走了进去。

I’ll ring and see if he is in.

我要按门铃看他是否在家。