当被改变时厚度变化，在直径内部。

As the thickness changes, the inside diameter is altered.

youdao

每件事都有他自然的速度；当被改变的时候，令人不愉快的事情就会发生。

Everything has its own natural speed; when altered, unpleasant things happen.

youdao

每件事都有他自然的速度；当被改变的时候，令人不愉快的事情就会发生。当改变慢慢发生时就会很有效果，让行为自然而然的改变。

Everything has its own natural speed; when altered, unpleasant things happen. Change is most effective when it occurs slowly, allowing behaviors to become automatic.

youdao

And when a compound is decomposed, the atoms are recovered unchanged.

当一个化合物被分解的时候，原子有恢复原来未曾改变的面貌。

麻省理工公开课 - 固态化学导论课程节选