崖燕也以泥巴筑巢，只是筑成的巢像烤箱，只留一个小圆。
Cliff swallows construct ovenlike nests, also out of mud but with a small round entrance hole.
但是，雨燕从2月末开始就入住赛耳彭，紫崖燕也在4月的最初几周开始生活于此。
And yet the swallows had been in Selborne since the end of February, the martins since the early weeks of April.
人类的身边有着众多朝夕共处但并不显眼的生物，雨燕和紫崖燕只是其中一例。正是因为它们的存在，人类所熟知的事物和地方才拥有了全新的意义。
The martins and swallows were but one example of the many life-forms co-existing so unobtrusively31 alongside humans, and for which familiar objects and places had entirely different meanings.
崖沙燕是一种腹部为白色的褐色的鸟。
崖沙燕是一种腹部为白色的褐色的鸟。
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