license plate number
noun [ C ] US uk/ˈlaɪ.səns pleɪt ˌnʌm.bər/ us/ˈlaɪ.səns pleɪt ˌnʌm.bɚ/ (UK usually registration number)
汽车牌照号码
the official set of numbers and letters shown on the front and back of a road vehicle
You couldn't see the vehicle's license plate number. 你看不到那辆车的牌照号码。