1 to connect

2 to relate to

3 to tie up

4 to bind

5 to be (literary)

1 to educate

2 to teach

3 education

1 series

2 set

1 system

2 classifier: 个 gè

1 variant: 联系 lián xì

1 to plant trees in order to stabilize sand (idiom)

1 lit. whoever hung the bell on the tiger's neck must untie it (idiom)

2 fig. whoever started the trouble should end it