a certain amount of的用法和样例：
- The railroad gives free transportation for a certain amount of baggage.
- We anticipate that we will meet a certain amount of resistance to our plan.
- A certain amount of needle has crept into (ie gradually appeared in) this game.
- Most of us have to read a certain amount of material for one reason or another.
- A certain amount of malice kept him in condition.
- Third, there is a certain amount of conceit.