but they must still survive the attacks of other, more specialised, birds of prey. 但它们仍须躲过 其它更专业的猛禽的攻击
some more than 20 centimetres long. 有的蚰蜒能长到20厘米长
the water takes on a new, more erosive power. 水便有了一股新的、更强的侵蚀力
But the dissolving power of rainwater has other, much more dramatic effects underground. 不过在地下 雨水的溶解作用 还能产生其它更壮观的效果
When the water reaches the more resistant bed of limestone 当水流遇到更坚硬的石灰岩床时
They can stay down for more than 30 seconds 它们能在水下呆30多秒
more than in the whole of the Atlantic Ocean. 这比整个大西洋的鱼类种数还要多
Baikal seems more like an ocean than a lake. 贝加尔湖看起来 更像是海洋 而不是湖泊
Its tropical waters teem with more fish species than any other lake. 生活在这个热带湖泊里的鱼类 比其它湖泊都要丰富
Worldwide lakes hold twenty times more fresh water than all the rivers. 全球湖泊淡水储量比江河多20倍