我们在这说的燕窝是由多种雨燕生产出来的，尤其是金丝燕在做巢时会排放一种化学混合物，使空气变冷。
The nests in question here are produced by a variety of Swifts, specifically Cave Swifts who produce the nest by spitting a chemical compound that hardens in the air.
本文所研究的燕文化是指从西周初年到秦统一之前，由生活于燕国的燕人所创造的考古学文化遗存。
Yan studied in this paper from the Western Zhou Dynasty culture refers to before the Qin unification, by living in the State of Yan Yan who created the archaeological and cultural relics.
林先生：你好！现在由李燕带你们参观我们的学校。
Mr Lin:How do you do? Now Li Yan will show you around our school.
这要求一种特殊的燕窝，是由一种特殊的金丝燕做的，这种金丝燕大部分被发现于东南亚。
It requires a special kind of nest, made by a particular species of swiftlet, a tropical bird mostly found in Southeast Asia.
这要求一种特殊的燕窝，是由一种特殊的金丝燕做的，这种金丝燕大部分被发现于东南亚。
It requires a special kind of nest, made by a particular species of swiftlet, a tropical bird mostly found in Southeast Asia.
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