1N-UNCOUNT [oft with poss]余晖;晚霞;残光 The afterglow is the glow that remains after a light has gone, for example after the sun has gone down. 余晖;晚霞;残光 [literary]
...the light of the sunset's afterglow.
落日的余晖
2N-UNCOUNT 余韵;美好的回忆 You can refer to the good feeling or effects that remain after an event as the afterglow . 余韵;美好的回忆
...basking in the afterglow of their Champions League victory. [+ of]