use for中间什么都不加，什么意思

use for: vt. 用于(用...做...)

例句与用法:
1. My advice may be of use for you.
我的意见也许对你有用。

2. I've no use for people who don't try.
我讨厌那些不想努力的人.

3. Jane: What are we going to use for bait?
珍妮：我们用什么当饵？

4. Can you tell me which instrument to use for the experiment?
你能告诉我用哪台仪器做这试验吗？

用于