Step piston
[化] 级差活塞; 阶梯形活塞
🧩 词语组成解析
step
[stɛp]
n. 步，脚步;步骤，手段;步调;级别;
vt.& vi. 举步，行走;踩，踏上;跨入;轻快地走;
vi. 踏，踩;走;
vt. 跳舞;迈步;使成阶梯状;
piston
['pɪstən]
n. <机>活塞;
🗣️ 情景例句
I'd like you to be the photo editor of the magazine.
我希望你能做杂志的摄影编辑。
I wish we had a baby.
我希望我们有个小宝宝。
But they would not listen to him. When they came to the river, a white man was waiting in the boat for them.
但是他们不听，当他们来到江边时，一个白人正在船上等着他们。