Definition [Oxford Dictionary]: 1. Return to a normal state of health, mind, or strength. ( 表示恢复到一个健康的身体或者心理状态) 2. Find or regain possession of (something stolen or lost). (表示找回曾经失去或者被偷窃的东西)

Example:

After his health recovered he returned to Oxford and in 1849 was awarded a double first in mathematics and classics.

As for Sally, she recovered and soon returned to her old self, never again mentioning what had happened.

Definition [Oxford Dictionary]: Bring back or re-establish (a previous right, practice, or situation) (修复某个物品或者事情到之前的状态)

Example:

Order was eventually restored by riot police.

With her confidence restored, Ling Yi plunged wholeheartedly into her work.

The building has been restored. 

注意：Restore修复更多的是维持和保养现状，而Recover恢复则是从失去到重新拥有

Definition [Oxford Dictionary]: 1. Get or bring (something) back from somewhere. (找回；收回，取回) 2. Find or extract (information stored in a computer)(检索)

Example:

It took four days to retrieve all the bodies from the crash.

I sat down in a chair in the waiting area while he went and retrieved the proper paperwork.

Definition [Oxford Dictionary]: Obtain possession or use of (something, typically a quality or ability) again after losing it. (着重指通过努力使失去的东西复得)

Example:

Under Deng Xiaoping, the reformers slowly regained control of the country.