1 each other

2 mutually

3 mutual

1 to be connected

2 traffic

3 transportation

4 communications

5 liaison

1 common

2 ordinary

3 general

4 average

1 to join

2 to connect

3 to link up

4 to communicate

1 surname Xiang

1 lit. doesn't (even) enter a single aperture (of one's head)

2 I don't understand a word (idiom)

3 it's all Greek to me

1 traceable to the same stock (idiom); of a common origin (of trends, ideas etc)

1 grasp this fundamental point and all the rest will follow (idiom)

1 don't fight, won't make friends (idiom); an exchange of blows may lead to friendship

1 lit. don't fight, won't make friends (idiom); an exchange of blows may lead to friendship

2 no discord, no concord