back-up ring 挡圈 ; 背压环
step-up ring 大小连接环 ; 转接环
front-up ring 正锁环
interlocked back-up ring 联锁支撑环
ring up 打电话 ; 打电话给 ; 给某人打电话
servo follow-up ring assembly 伺服随动环形装置
follow up ring 随动环
Pop-up ring sealing box 弹环密封盒
Instead of listening to the cry of agony they listen to the ring of dollars and stoop down and pick up the coins."
怨言绕耳过,硬币叮当落,速拾不嫌多"
Benzene is a ring that's made up of six carbon atoms and six hydrogen atoms.
苯环是一个由六个碳原子,和六个氢原子组成的环。
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