First we will set up a simple logical test that checks to make sure the speed of a swallow falls within a specified range, since the airspeed of a swallow may vary.

首先，我们将设置一个简单的逻辑测试用于检查确保燕子坠落的速度在规定的范围内，因为燕子的空中速度可能不同。

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To find America's fastest roads, Inrix first looked for stretches of roadway where motorists routinely drive fast, then it found the speed range at which each roadway's fastest 5% of drivers travel.

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