如果全球股市已被高估，应该出现回调，那么投资者开始抛售就不需要一个好理由，一个普通的理由即可。
If global equities are overvalued and due a correction, investors do not need a good reason to start selling, just a popular one.
一个理由是，这样做在修改实现规则时不需要重新访问uml模型。
Amongst other reasons, this allows me to change my implementation rules without revisiting the UML model.
如果你想读经典名著，那需要一个好的理由，不需要因为从来没有读过名著而感到羞愧。
If you want to read the classics, read them for good reasons - not just because you're embarrassed that you've never read them before.
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