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.
确切来说，轮询器是一种机制，在有变化时轮询不同端点，并在感知到某些内容发生变化后让适配器对其做出响应，就像一个事件。
A poller is exactly what it sounds like: it's the mechanism that polls different endpoints for changes and, if some thing's perceived to have changed, let's the adapter react to it as an event.
它们能直接察觉到地震波，或是感知到地倾斜的变化（常在地震数分钟前发生）。
They could detect seismicwaves directly or ground tilt (which can occur in the minutes before a quake).
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