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
The cold water cools the moist warm air above it 冷水使得上方的暖湿气流冷却
but they nonetheless need a regular supply of water. 但它们仍须定期补充水
The sun's heat and power to evaporate water 太阳的热力使水蒸发
But it is the only source of water, 可是这是唯一的水源
Their biggest problem is the lack of water, 它们最大的困难莫过于缺水
The only water Lechuguilla has are these wonderfully still clear pools. 龙舌兰洞中唯一的水 来自这些平静清澈的水塘
Water is the creator of most caves, 水是大部分洞穴的建造者
Without water one might not expect to find any caves, 没有水的地方似乎不可能有洞穴
It mixes with oxygen and the water, 与水中的氧发生化合反应