When full, a saguaro stem can store up to five tonnes of water 吸饱水后 弁庆柱的茎干中 已储存了5吨左右的水

168. are ready to take full advantage of it.
     准备充分利用雨水
169. After a rainstorm the saguaro's long shallow root system sucks up the water
     暴风雨过后 弁庆柱 用又长又浅的根系吸收水分
170. and the pleats on its trunk enable it to expand rapidly.
     茎上的皱褶使之能迅速膨胀
171. When full, a saguaro stem can store up to five tonnes of water
     吸饱水后 弁庆柱的茎干中 已储存了5吨左右的水
172. and that's enough to see it through many months of drought.
     这足以帮助它们度过几个月的旱季
173. The trunks of these huge plants provide homes for the gila woodpecker.
     这些立柱般的巨型植物 为橙腰啄木鸟提供了住所
174. But birds are not the only animals to benefit from the presence of the cacti.
     不过鸟并非唯一从仙人掌那里 获得好处的动物

来自《行星地球 第一季 第五集 Planet Earth S01E05 沙漠》第 171 行