The use case describes the main success scenario, according to which the purchaser buys the stock, and several extensions for what could go wrong.
用例将描述主要成功方案（购买者根据这些方案购买股票）和一些可能出现错误的扩展。
If I lived my life worrying about what could go wrong, I'd never accomplish a thing.
如果我这辈子总在担心什么东西会变糟，我就会一事无成。
All I know is that constantly worrying about the future and what could go wrong creates massive stress and unhappiness.
我所知道的是，不断地担心未来，担心事情会出错只会带来巨大的压力和烦恼。
All I know is that constantly worrying about the future and what could go wrong creates massive stress and unhappiness.
我所知道的是，不断地担心未来，担心事情会出错只会带来巨大的压力和烦恼。
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