随着鸟儿获得的经验越多，它们丢弃的草茎数目就越少。
As birds gained more experience, they dropped blades of grass less often.
它们应该是用泥土和草茎搭起来的，她判断，但是长期的风雨也已经将其冲刷成一片残迹。
They had been built of mud and straw, she judged, but long years of wind and rain had worn them away to nothing.
有一次她撞见了一只老鼠正在小溪中饮水，她的出现令它突然奔窜于草茎中，消失于高高的草海当中。
Once she came upon a rat drinking from the stream, but it fled when she appeared, scurrying between the stalks to vanish in the high grass.
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