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

166. When the summer monsoon blows in
     当夏季季风吹来时
167. the giant saguaros, one of the biggest of all cacti,
     巨大的弁庆柱 ——一种世界上最大的仙人掌
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

来自《行星地球 第一季 第五集 Planet Earth S01E05 沙漠》第 169 行