Piston expander
[化] 活塞式膨胀机
🧩 词语组成解析
piston
['pɪstən]
n. <机>活塞;
expander
[ɪk'spændə]
n. 使增大者，使身体健壮的强身器具;
🗣️ 情景例句
Who's this?
你是谁？
It's a sunny day.
今天是个艳阳天。
Broadly speaking, human beings may be divided into three classes: those who are toiled to death,
劳累至死的人、