我们要的就是唯一的爱 One love is all we need
他们认为，我们所能做的最好的事情就是把它控制在一个合理的水平，而在这方面目前唯一重要的选择就是减少碳排放。
They believe that the best we can do is keep it at a reasonable level, and at present the only serious option for doing this is cutting back on our carbon emissions.
唯一要告诫的是我们的目标类本身恰恰就是拦截过滤器。
The only caveat is that our target class happened to be intercepting filter itself.
要真正理解TDD，唯一的办法就是实践。让我们从一个简单的例子开始，这个例子并不要求任何特殊的工具。
The only way to really understand TDD is to do it, so let's start with a very simple example that doesn't require any special tools.
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