Vacuum valve
[化] 真空阀
🧩 词语组成解析
valve
[vælv]
n. 阀;真空管;（管乐器的）活栓;（心脏的）瓣膜;
vt. 装阀于;以活门调节;
🗣️ 情景例句
78 percent of black high-school graduates are unemployed.
百分之四十八的黑人高中毕业生失业。
OFF. It gets dark.
断开开关，它就会熄灭。
What about some sugar?Two teaspoonfuls?
加些糖怎么样？两茶匙行吗？