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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Another drop falls and the Swallow looks up.

又一滴水掉下来了，小燕子仰起头来看。

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As a result, arrangements were made for the double agents, their families and minders to stay at hotels including the Eagles hotel in Llanrwst, the Swallow Falls Hotel in Betws y Coed and the White Heather Hotel and the Evans Hotel in Llandudno.

BBC: NEWS | UK | Wales | War spy secrets revealed