这就是机器零件在使用中磨损的原因。

That is why the machine parts wear away during use.

youdao

“没有什么是永远存在的！”然而，在这个陈述中，我们想到的是人工制造的技术性物体和产品，它们在使用过程中受到自然磨损。

"Nothing lives for ever!" However, in this statement we think of artificially produced, technical objects, products which are subjected to natural wear and tear during use.

youdao

那就是机器零件在使用过程中磨损的原因。

That is why the machine parts were wearing away during use.

youdao