1·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.
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。
2·I did not realize that as I bound the power of river, swifts and stone into the metal, I also filled the sword with sorrow and the despair of death.
我没有意识到，当我将河流、雨燕和岩石的力量注入剑时，也把对死亡的悲痛和绝望带入其中。
3·Bird's nest soup is a delicacy in Chinese cuisine. A few species of swift, the cave swifts, are renowned for building the saliva nests used to produce the unique texture of this soup.
燕窝是一种中国美食，某些品种独特的雨燕是用自己的唾液来筑巢的，这种鸟巢就用来当燕窝的原料。