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 the sort of behaviour that can make all the difference in a place of serious shortages. 这一举措在这个资源 严重匮乏的地方显得极为重要
that these elephants walk up to 50 miles a day 所以这些大象每天得走上50英里
So how on earth does a plant-eater this size survive in a place apparently totally devoid of vegetation? 那么在地球上 如此巨大的植食动物是如何 在这个寸草不生的地方生存的呢
but this desert river holds a secret. 但是这条沙漠河流却藏着一个秘密
His rank earns him the loyalty of a harem of females 它的地位为它赢得了一群忠诚的母羊
But victory here will gain important ranking points on a male's way to the top. 但是这里的获胜者会获得重要的排名 一步步到达公羊排行榜的第一位
and they are squaring up for a duel. 它们正摆好架势准备激战
a smart ibex knows that the best thing to do is to gain higher ground. 聪明的羱羊很清楚 最好的战术就是占领制高点
So the saguaro's success in developing a way to store water 看来弁庆柱进化出的 这种成功的储水方式