1 to exchange

2 exchange

3 communication

4 interaction

5 to have social contact (with sb)

1 weaponry

2 weapons

3 arms

1 sharp weapon

2 effective implement

3 outstandingly able individual

1 device

2 tool

3 utensil

4 classifier: 台 tái

1 machine

2 classifier: 台 tái

3 classifier: 部 bù

4 classifier: 个 gè

1 spare the rod and spoil the child (idiom)

1 man seeks his way up just as water seeks its way down (idiom)

2 one should constantly strive to make progress

1 to commit to the waters (idiom); to lose sth irrevocably

1 widely praised (idiom); with an extensive public reputation

1 to wallow in the mire with sb (idiom); to follow the bad example of others