Frigates are the world's lightest bird, relative to their wingspan 阿森松军舰鸟是世界上最轻的海鸟之一 翼展特别长

237. might seem to offer perfectly good sites for a nest
     却提供了一个筑巢的好地方
238. but the frigates choose an even more isolated site
     不过军舰鸟要挑选偏僻的地点
239. Boatswain Bird Island, a lonely pillar, just of Ascension's coast.
     水手长鸟岛 阿森松岛旁边的一个偏僻小岛
240. Frigates are the world's lightest bird, relative to their wingspan
     阿森松军舰鸟是世界上最轻的海鸟之一 翼展特别长
241. and they can soar for weeks on end with minimal effort.
     它们只需要很小的付出就能在海上飞行好几个星期
242. They seem much more at home in the skies, than in a crowded colony on land
     相对于地上拥挤的巢穴, 在天上飞就悠然自得多了
243. but nest, they must.
     不过筑巢是必须的

来自《行星地球 第一季 第十一集 Planet Earth S01E11 海洋深处》第 240 行