vt.& vi.（使）变红
vi.（由于羞愧、愤怒、天气热等）脸变红
Humans redden when they are angry.
“人类愤怒时会脸红. ”
I saw him redden with pleasure.
我看到他高兴得脸都红了.
Han seemed to redden slightly, like the sun suddenly showing through on a cloudy day.
韩学愈似乎脸色微红, 像阴天忽透太阳.
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