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To ensure tight closure, and the valve seat valve sealing surface of the ground.
为了保证关闭严密，阀瓣与阀座密封面进行的研磨。
youdao
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The piece serves as a walkable surface able to seat up to 15 people.
该建筑表面可行走，最多可容纳15人。
youdao
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The piece serves as a walkable surface able to seat up to 15 people.
该建筑表面可行走，最多可容纳15人。
youdao