Valve cover
[化] 阀套
🧩 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
Thank you.
谢谢。
How much does packing take up of the total cost of the goods?
包装占货物总成本的百分比是多少？
It seems all right.
看来这没问题。