Packless valve
[化] 无填料阀
🧩 词语组成解析
[化] 未包装的; 无填充的; 无填料的
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
Subway transportation is very advanced in Longdon.
伦敦地地铁非常先进。
He can't come and he sends his apologies.
他为他的不能前来致歉。
'It's all right,' she said, 'but isn't it upside down?'
是不错，她说到，但你不觉得有些混乱吗？