Within activity: object, activity: target, and atom: author elements are one or more activity: object-type elements that contain an atom URI defining the parent object.

在activity： object、activity： target和atom： author元素中有一个或多个activity： object - type元素，它们包含一个定义前辈对象的atom URI。

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And this is just a picture showing some of these sizes with their parent. So, for example, a lithium here, you can see how lithium plus is smaller than the actual lithium atom in its neutral state.

这是一张对比图，展示某些离子与它们的母体，比如，这里是锂，大家可以看到正一价锂离子是多么的小，与中性锂原子相比。

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