The police ran a check on the registration number of the car.

警方对那辆车的牌照号码进行了调查。

What's your registration number?

你挂的是几号？

Registration Number must be all digits.

注册码必须全都是数字。

What does the registration number mean?

获得注册号意味着什么？

What's your registration number in customs?

你们公司的海关注册号秒是多少？