例如，科学家知道没有四肢的蛇钻洞更有效率，但是它们的四肢究竟是如何退化的，依然是个谜。
For instance, although scientists know snakes can burrow more efficiently without arms and legs, exactly how they lost their limbs remains a mystery.
布劳恩表示该奈米结构不能避免退化，但是该处理会延迟退化，因为它的效率是传统电池的10倍。
The nanostructure isn't immune to degrading, but this process is prolonged because its efficiency is 10 times greater than conventional batteries, Braun said.
老年人以睡眠时间减少、睡眠效率降低、睡眠障碍多、催眠药物使用多为特点，似乎与脑功能退化有关。
The elderly population characterizes diminution of sleep time, reduction of sleep efficiency, sleep disorder and more hypnotic using, which seems related to cerebral functional deterioration.
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