压进板内的都是圆型，无内牙。

Press in board inside are round, no inner teeth.

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根据二阶应力边界条件，确定出了固体板内的二阶积累波。

Second-order cumulative waves have been fully determined by applying the boundary condition of second-order stress.

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曲轴穿过侧板、隔板及两个压缩缸，并由两个侧板内的轴承支撑。

The crankshaft passes through the lateral plate, the separator plate and the two compression cylinders, and is supported by a bearing between the two lateral plates.

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We have a zinc plate up here, and we're going to -- in a minute I'll describe how we can probe if electrons are coming off of it.

我们有一块向上的锌板，我们将在一分钟内描述,我们是怎样探测出,是否有电子从上面射出的。

麻省理工公开课 - 化学原理课程节选