valve

小号手按下阀门来改变音高。

The trumpet player pressed a ___valve to change the pitch.

旁通阀有助于控制管线上的压力。

A bypass ___valve helps to control the pressure on the line.

轮胎的气门芯需要更换了，因为它漏气。

The tire's ___valve needs to be replaced because it's leaking air.