It isn't really a principle; it's a cheap trick to justify what you already believe.
它并不是一个真正的原则，它是一种验证你已经相信事物的低廉把戏。
Yes, it's reasonably fast but it certainly isn't cheap. Fares have gone up25%.
是的，它相当快，但是它当然不便宜。价格涨了25%。
They hope it could lead to cheap portable breath test devices that family doctors could use to detect an illness that often isn't diagnosed till it's too late to cure.
他们希望能够生产出价格便宜的便携式呼吸测试仪器，家庭医生可以进行检测。而一般情况下，这种疾病被诊断出来的时候已经来不及进行医治。
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