often more than 60 metres from the floor. 通常高出地面60多米
The work may be hazardous in the extreme, 这项工作看起来极度危险
The pure white nests of cave swiftlets 洞金丝燕的纯白燕窝
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
and using ladders made from forest vines the gatherers climb into the highest reaches of the cave 采集者利用树藤编成的梯子爬到洞穴的最高处
The nests are very precious objects, 燕窝是非常珍贵的东西
but in the pitch black the swiftlets manage unerringly to locate their individual nesting sites, 但是金丝燕却能在黑暗中 准确无误地到达自己的筑巢点
Bats are not the only commuters in these Bornean caves. 蝙蝠并非婆罗洲洞窟中的唯一常客