bumper和valve有什么区别（valveindex2.0和1.0有什么区别）

bumper是保险杠的意思，而valve则是阀门的意思，区别可以从以下例子看出：

The bumper is the protection in the front of your car, you can see it, and valve is inside the engine, control the air in and out, you can't see it. 保险杠是汽车前部的保护装置，您可以看到它，而阀门在发动机内部，控制着空气的进出，您看不到它。