Yet the nightly onslaught has little impact on bat numbers - 然而 每天傍晚的攻击只会 对蝙蝠数量产生很小的影响
In Borneo, rain has sculptured the limestone into extremely sharp-sided pinnacles. 在婆罗洲 雨水已将石灰岩 雕凿成无比尖削的石塔
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
Any animal that lives in a cave has to cope with complete blackness, 住在洞穴里的动物都必须 适应彻底黑暗的环境
their fresh water has brought life and abundance to planet Earth. 淡水为地球带来了无数生机与富饶
This river has cut the world's longest canyon system - 这条河冲蚀出了世界上最长的峡谷系
Arizona's Colorado river has eaten away at the desert's sandstone 亚利桑那州的科罗拉多河 冲走了大量沙石
has bushy gills to extract oxygen from the current. 并依靠浓密的鳃从水中过滤氧气
and the eagle has to struggle to control it. 金雕不得不努力控制飞行
By midsummer its larger, more famous relative, has retreated into a cave. 到了仲夏 它那更大更有名的亲戚 便会躲进山洞