1 to connect

2 to relate to

3 to tie up

4 to bind

5 to be (literary)

1 to have sth to do with

2 to relate to

3 related to

4 to concern

5 concerning

1 unrelated

2 having nothing to do (with sth else)

1 variant: 联系 lián xì

1 see also: 转文 zhuǎi wén

1 one man can hold the pass against ten thousand enemies (idiom)

1 a matter of no concern to oneself (idiom)

1 to feel unconcerned and let matters rest (idiom)

1 human life is beyond value (idiom)

1 to share the same interests (idiom)

2 to be closely related

3 to be in the same boat