活塞的英文：
piston
valve

参考例句：

The connecting-rod is attached to the piston by the piston pin.
连杆与活塞的连接是采用活塞销。

free - piston compressor
自由活塞压缩机

A large, valved, brass wind instrument with a bass pitch.
大型带活塞的低音铜管乐器。

Power plant is a power of 140 hp piston engine.
动力装置是一台功率140马力的活塞发动机。

The piston end of the rod is attached to the piston by the piston pin, or wrist pin
连杆的活塞端用活塞销或销轴安装在活塞上。

He is tapping the cask of cider.
他正在打开桶的活塞从里面汲取苹果酒。

When the hydrodynamic front reaches the ambient medium it acts like a fast-moving piston
当流体力学波阵面抵达周围介质时，它像一个运动迅速的活塞。

Reduce plunger forward time
减少活塞推进时间

The rapid to-and-fro movements of a piston
活塞快速的往复运动.

My container here has a piston on it.
我的容器上有一个活塞。

piston是什么意思：
n. 活塞

The connecting-rod is attached to the piston by the piston pin.
连杆与活塞的连接是采用活塞销。

The piston is reciprocating inside cylinder.
活塞在汽缸内部往复运动。

My container here has a piston on it.
我的容器上有一个活塞。

a ring for packing pistons or sealing a pipe joint.
填塞活塞或垫在导管接头的圈环。

Connecting rods and pistons are removed as assembly from the engine.
把连杆和活塞做为整体组件从发动机上拆卸下来。

valve是什么意思：
n. 阀门；瓣膜；真空管
v. 装阀于；以活门调节

Valve Disadvantages: The valve is difficult to close and requires the operator to double close the valve.
阀门的缺点:阀门难以关闭，要求操作者二次关闭阀门。

pilot valve governor
带伺服电动机的调节器辅助调速器

The valve has jammed shut.
阀门给卡住了打不开。

multiple leaf valve
多簧片阀

cooled anode valve
冷板屏极真空管