1 surely

2 certainly

3 necessarily

4 fixed

5 a certain (extent etc)

6 given

7 particular

8 must

1 to substitute

2 to act on behalf of others

3 to replace

4 generation

5 dynasty

6 age

7 period

8 (historical) era

9 (geological) eon

1 representative

2 delegate

3 classifier: 位 wèi

4 classifier: 个 gè

5 classifier: 名 míng

6 to represent

7 to stand for

8 on behalf of

9 in the name of

1 ancient times

2 olden times

1 basic

2 fundamental

3 main

4 elementary

1 small capital, huge profit (idiom); to put in a little and get a lot out

1 (idiom) it's a deal

2 that's settled then

1 to talk shop all the time (idiom)

1 to be impervious to reason (idiom)

2 unreasonable

1 not understanding things (idiom); devoid of sense