A used object is dirty or spoiled because it has been used, and usually needs to be thrown away or washed.
a used cotton wool ball stained with makeup.
一个沾着化妆品的用过的棉花球。
A used car has already had one or more owners.
secondhand
Would you buy a used car from this man?
你会向这个人买辆二手车吗?
be used to
If you are used to something, you are familiar with it because you have done it or experienced it many times before.
I'm used to having my sleep interrupted.
我习惯了睡觉时被吵醒。
get used to
If you get used to something or someone, you become familiar with it or get to know them, so that you no longer feel that the thing or person is unusual or surprising.
This is how we do things here. You'll soon get used to it.
这是我们这里的做事风格。你很快就会习惯的。
You quickly get used to using the brakes.
你很快会习惯用刹车。
used to
If something used to be done or used to be the case, it was done regularly in the past or was the case in the past.
People used to come and visit him every day.
过去每天都有人来拜访他。
He used to be one of my professors.
他过去是我的一个教授。
did not use to , used not to
If something did not use to be done, used to not be done or used not to be done, it was not done in the past.
Borrowing used to not be recommended.
借东西在过去是不提倡的。
At some point kids start doing things they didn't use to do. They get more independent.
从某时起,孩子们开始做他们过去没做过的事情。他们变得更独立。