youdao

Complete reflection of a ray of light in a medium such as water or glass, from the surrounding surfaces Back into the medium.

在一种媒质（如水或玻璃）中的光线从媒质的边界完全反射回媒质内部的现象。

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Contrary to popular belief, the light at the back of the raindrop does not undergo total internal reflection and some light does emerge from the back.

大家普遍认为的相反，鉴于在后面的雨滴不接受全内反射和一些轻没有摆脱回来。

youdao

Part of this light is reflected back, and the pattern of reflection indicates activity in the tissue it has been reflected from in particular, changes in the flow of blood to that tissue.

ECONOMIST: Lie detection