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
Are you going to return it here?
你要在这里归还吗？
If I wanted to rent a van, how much would it cost?
要是我租一辆搬运车，得花多少钱？
Good afternoon, Li Lei! Nice to meet you. How do you do?
你好。见到你很高兴。