grayswandir: Shen Wei looking at Zhao Yunlan. (Guardian: Shen Wei/Zhao Yunlan)
grayswandir ([personal profile] grayswandir) wrote in [community profile] guardian_learning 2023-07-12 07:27 am (UTC)

当光线垂直射入镜面的时候, when light rays strike the mirror surface vertically

I just looked this up out of curiosity, and I think 垂直 may mean "perpendicularly" here, since if I remember, the angle of the light in this episode is actually horizontal, hitting the mirror that's standing upright. (It's a new word to me either way!)

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