1 to be connected

2 traffic

3 transportation

4 communications

5 liaison

1 Russia

1 credit card

1 rechargeable card

2 to recharge a card

1 to stop

2 to block

3 (computing) (coll.) slow

4 (loanword) card

5 classifier: 张 zhāng

6 classifier: 片 piàn

7 truck (from "car")

8 calorie (abbr. for 卡路里[kǎ lù lǐ])

9 cassette

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

1 to act in collusion (idiom)

1 mutual exchange of assistance (idiom)

2 to benefit from each other's strengths and make up each other's shortfalls

3 to reciprocate with material assistance

4 scratch each other's back

1 lit. the Eight Immortals cross the sea, each showing his own special talent (idiom)

2 fig. (of each individual in a group) to give full play to one's unique capabilities