The seal ring shell has a front piece and a back piece secured together.

密封环壳体具有紧固在一起的前件和后件。

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The front piece further includes a radially extending shin portion connected to the foot portion and located radially outward of the foot portion.

前件进一步包括连接至足部并径向定位在足部外的径向延伸的胫部。

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The front piece includes a foot portion defining an axially extending engagement surface for interference-fit engagement with the annular surface of the seal ring.

前件包括限定与密封环的环形表面干涉配合式接合的轴向延伸的接合表面的足部。

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That test is the piece of paper you have in front of you.

这个测试就是放在你们面前的那张纸。

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So how many time do you think-- you all have a piece of paper in front you-- how many time do you think you need to roll over the piece of paper ? for the piece of paper to reach the moon?

你们认为需要折多少次-,你们面前都有一张纸-,你们认为需要将纸折叠多少次,才能碰到月亮？

哈佛公开课 - 幸福课课程节选

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