- These birds are unusual for another reason.
这些鸟之所以特别还有另外一个原因 - Their little cup-like nests are made entirely from threads of saliva.
它们小巧的杯状燕窝完全由唾液丝筑建 - It takes more than 30 days to complete one.
每个燕窝得花上30多天才能完工 - The nests are very precious objects,
燕窝是非常珍贵的东西 - and not only for the birds.
不仅只是针对这些鸟而言 - For 500 years people have been harvesting the nests of cave swiftlets.
500年来 人们一直采集洞金丝燕的燕窝 - It's a very risky business.
这是一项非常危险的工作
The nests are very precious objects, 燕窝是非常珍贵的东西
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