单词：valve cup
valve cup的用法和样例：
例句
- Slide the diaphragm assembly into the relief valve seat.将隔膜总成滑进到安全阀阀座内。
- All valve seats and seat discs shall be replaceable.所有阀门阀座和阀座阀瓣应该是可更换的。
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老外最常用的英文短语