相对论告诉我们的一件事是长度的收缩。

One thing relativity tells us about is length contractions.

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烧结零件可以实现尺寸控制，因为注塑密度明显均匀，所以烧结收缩也是均匀的。

Dimensional control can be exercised on the as-sintered component as the injected density is sensibly uniform so shrinkage on sintering is also uniform.

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通径收缩能使零件尺寸缩小，开、闭所需力相应减小，同时可扩大零部件的应用范围。

Path shrink parts sizes shrink, open and close the required power is reduced, at the same time expand the scope of application components.

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