但是，如果您拥有两个没有上下级关系的元素，而且它们在树形结构中不是同一层次，那么它们的事件引发序列就是不同的。
However, if you have two elements where there is no direct parent-child relationship and they do not lie on the same level in the tree structure, their event firing sequence is not fixed.
人类在自己的历史上第一次拥有了和人类不幸作战的强大技术力量，可是却把它们浪费在毫无意义的追求上。
For the first time in his history, man has the overwhelming resources to combat human suffering, yet he squanders them on meaningless pursuits.
其规模有助于此：它总是在某些地方拥有一些工厂能够默默地盈利几个月，再接受维修工人们的一次开门大扫除。
Its size helps: it always has some big plants somewhere that could benefit from a few months of quiet so that maintenance workers can open them up for a good scrubbing.
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