人体某个部位在生命周期中不同时期的重要性有时会改变。
Sometimes, the significance a body part holds in one's clinical life changes over time.
这些标签一般不能改变，但可以将其移动到片段的不同位置(同时保持片段中标签的顺序和编号)。
Although these tags cannot be changed in general, they can be moved to a different location in the segment (while maintaining order and number of tags in the segment).
不幸的是，我从未有过不得不同时进行如此多改变的经历，因此，我无法给你提供太多有关这方面的建议。
Unfortunately I've never had to do so many things at once, so I can't give much advice on that.
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