A piston is a short, solid piece of metal that sits tight inside a tube.

A piston ispiston是 a short, solid piece of metal一小段堅實的金屬， that sits tight inside a tube緊緊卡在管子裡。

In a car engine, fuel burns and pushes the piston up and down. That up-and-down move turns other parts of the engine, and that is what makes the car go.

In a car engine在汽車引擎裡， fuel burns燃料燃燒， and pushes the piston up and down把piston往上往下推。 That up-and-down move這個上下的動作 turns other parts of the engine會轉動引擎的其他零件， and that is what makes the car go而這就是讓車子跑起來的原因。

Some pumps use a piston too: the same snug piece sliding in a tube, pushing water or air. On a trumpet, the buttons you press are also called pistons; they are little sliding pieces that change the note.

Some pumps use a piston too有些幫浦也用piston： the same snug piece sliding in a tube一樣是緊貼著在管子裡滑動的零件， pushing water or air推動水或空氣。 On a trumpet在小號上， the buttons you press你按的那些按鍵 are also called pistons也叫做pistons； they are little sliding pieces它們是小小的滑動零件， that change the note會改變音符。

The picture to keep is the same: a close-fitting piece moving in and out of a tube. People may say something "pistons" when it moves with that hard, regular beat, but the noun is the meaning you will meet first.

The picture to keep is the same要記住的畫面都一樣： a close-fitting piece一個緊貼的零件 moving in and out of a tube在管子裡進進出出地動。 People may say something "pistons"有人可能會說某個東西在『pistons』， when it moves with that hard, regular beat當它以那種規律有力的節奏移動時， but the noun is the meaning you will meet first但你最先會遇到的意思是名詞。