Today less than a thousand of these desert specialists remain in the wild. 今天 这些沙漠专家的 野生数量已不足1000只
more than a mile from the surface, 位于地表之下1英里多的地方
and since this discovery more than 120 miles of passageways have been mapped. 自从那次发现之后 迄今已测绘了120多英里的地道
There is, in fact, more life here than anyone would think possible, 事实上 这里的生物数量 远比人们预料的更多
There may well be less than a hundred Texas cave salamanders in the wild. 世界上可能只有不到100只 野生洞栖童态河溪螈
So far, more than 350 miles of underwater galleries in the Yucatan have been mapped, 人们迄今为止已绘制了350英里的 尤卡坦半岛地下水系图
often more than 60 metres from the floor. 通常高出地面60多米
It takes more than 30 days to complete one. 每个燕窝得花上30多天才能完工
some more than 20 centimetres long. 有的蚰蜒能长到20厘米长
They can stay down for more than 30 seconds 它们能在水下呆30多秒