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
as they travel up the dry river channels searching for something to eat. 沿着干涸的河床搜寻一些可以吃的东西
and they follow him closely as he travels across this desert 它们一起紧跟着它穿越沙漠
When competitors are evenly matched as they are here, 同级别的参赛者在此公平竞争
The Sonoran desert in Arizona is not quite so dry as the Atacama - 亚利桑那州的索诺兰沙漠 并不像阿塔卡马沙漠那样干旱
In the Sahara the temperature can drop as much as 30 degrees during the night, 在撒哈拉沙漠中 晚上的气温会下降整整30℃
As the saliva dries it has to be replaced 唾液干了之后还得重新抹上
and, as the saliva evaporates, their blood is cooled. 因此 当唾液蒸发时 血液也能得到冷却