以自然光线下观察受试者的舌苔是否出现异常。
To observe the tongue-coating of subjects and comparison between normal and abnormal.
您可以在自然光线下看到它不经意中流露出来的光鲜闪耀。
You can see it under natural light come dressed casually in showing shine.
他们说，暴露在自然光线下和花时间看远处的物体可能是关键因素。
Exposure to natural light and time spent looking at distant objects could be key factors, they said.
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