声音向下传到中耳、内耳，然后传到你的大脑。
The sounds then travel down to the middle ear, the inner ear, and then to your brain.
因为从山顶向下传播的光会穿过许多这样的层，所以测量员看到的可能是海市蜃楼而不是山峰本身。
Because light traveling down from a summit passes through many such layers, a surveyor could sight a mirage rather than the peak itself.
当开发人员更加频繁地集成代码时，它们会更快地发现问题，并且在向下传之前修正它们。
When developers integrate their code more frequently, they discover problems sooner and fix them before they move downstream.
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