Valve Guide, Valve Seat, Valve Lock, Valve Spring Retainer, Casting Products.
气门导管，气门座圈，气门锁片，气门弹簧座，铸件系列。
No, no, no, no. A seat guide book.
不，不，是座位指南。
The guide required that all passengers must wear seat belts.
导游要求所有旅客必须系安全带。
The guide required that all passengers must wear seat belts.
导游要求所有旅客必须系安全带。
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