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

123. 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
124. It's a very risky business.
     这是一项非常危险的工作
125. with virtually no safety equipment
     事实上没有任何安全措施
126. 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
127. often more than 60 metres from the floor.
     通常高出地面60多米
128. The work may be hazardous in the extreme,
     这项工作看起来极度危险
129. but the rewards are great.
     但却能得到丰厚的回报

来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 126 行