a cooling off period的用法和样例：
- A cooling off period would work in your favor.
- After a cooling off period of seven days, the patient can sign a certificate of request. After 48 hours the wish for death can be met.
- The Hunter can call the pet at any time, however if it's died then there will be a short cooling off period before he can recall it.
- My new car cost me a cool thousand pounds.
- Let's go and have icecream to cool off.