河水深５公尺。

The depth of the river is 5 metres.

房间宽3公尺，深５公尺。

The room is 3 metres wide and 5 metres deep.

很深的根

very deep roots

这井很深。

This well is very deep.

挖深些

dig deeper

由浅入深

from easy to difficult

这本书很深，初学难懂。

This book is very difficult for beginners to understand.

很深的印象

deep impression

交情深

close friendship

情深

deep affection

两家关系很深。

The two families have very close relations.

深蓝

dark blue

深灰

dark grey

颜色太深。

The colour is too dark.

夜深了。

It is late at night.

深知

well aware

深表同情

show deep sympathy

深为惋惜

be greatly sorry

深为感谢

be very grateful

深怀戒心

be very wary

我也深有此感。

I also have a deep sense of this.