The treadle pump is easy to build from bamboo or other wood and two metal cylinders with pistons.

VOA: special.2009.08.17

Pistons in the car, right, so the piston goes up.

比如说这是汽车发动机。

麻省理工公开课 - 热力学与动力学课程节选

I like the Pistons, the Tigers, the Lions, Red Wings.

我喜欢活塞队，虎队，狮队，红翼队。

不喜欢洛杉矶的体育 - SpeakingMax英语口语达人

Former Detroit Pistons coach Chuck Daly also died in 2009.

VOA: standard.2009.12.24

Then you put two pistons, one on that side here and one on this side here, and the external pressure here, we're going to call that p1.

接下来我们放进两个活塞,一个在这，一个在这,这变外界的压强为p1；

麻省理工公开课 - 热力学与动力学课程节选