马特：没问题！一桶环呢，肯定能套着！

Matt: No problem! With this stack of hoops I'm sure to get one!

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介绍一种采用扫描方式测量锥面环、桶面环等活塞环外圆轮廓参数的测量仪。

An instrument that measures the outer profile parameters of piston rings such as conical rings, tubbish rings by scanning is introduced.

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两个推进剂罐由每个末端的圆顶，桶和环组成。

The two propellant tanks are composed of domes on either end, barrels, and rings.

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