在这个传递和反射的过程中，声音发生了变化，回声的变化使蝙蝠能够感知到目标的特征。

In this process of transmission and reflection, the sounds are changed, and the changes in the echoes enable the bat to perceive features of the target.

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许多研究发现，一种被称为条件反射的基本学习形式可以在睡眠中发生。

Many studies have found that a basic form of learning called conditioning can happen during sleep.

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当引入一套高科技的镜子，将阳光从邻近的山峰反射到下面的山谷时，情况发生了变化。

That changed when a system of high-tech mirrors was introduced to reflect sunlight from neighboring peaks into the valley below.

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