1 to use

2 to employ

3 to apply

4 to make use of

1 to use

2 to employ

3 to have to

4 to eat or drink

5 expense or outlay

6 usefulness

7 hence

8 therefore

1 need not

1 to enjoy (i.e. have the use or benefit of)

1 to act on

2 to affect

3 action

4 function

5 activity

6 impact

7 result

8 effect

9 purpose

10 intent

11 to play a role

12 corresponds to English -ity, -ism, -ization

13 classifier: 个 gè

1 to do two things at once (idiom)

2 to multitask

3 to divide one's attention

1 internal disunity dissolves at the threat of an invasion from outside (idiom)

1 to have an ulterior motive (idiom)

1 to have no other use or purpose (idiom)

1 obstinate and self-opinionated (idiom)