- This water fell as rain in mountains more than a hundred miles away.
这些水来自100英里之外的山地降雨 - It's known as a flash flood
它叫做“瞬时洪水” - and called that because the water may run for just a single day.
之所以这么叫是因为 这些水可能仅仅流淌一天左右 - It's an event that only happens once or twice a year at the most.
而且一年最多也只发生1～2次 - The sandy riverbed acts like a giant strip of blotting paper
布满沙子的河床像是一张巨大的吸水纸 - sucking up the water as soon as it appears.
水一边流淌一边被它吸去 - But every square metre of soil moistened by this river
这里的每一寸土壤都已被河水润湿
It's an event that only happens once or twice a year at the most. 而且一年最多也只发生1～2次
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