They change the mood in the music either from sad to happy or the other way around.
他们在音乐中情绪从悲伤变成快乐或者相反。
There is inadequate research, though, on the long-term impact of sad music on mood.
然而，关于伤心音乐对情绪的长期影响的研究并不充分。
There is inadequate research, though, on the long-term impact of sad music on mood.
然而，关于伤心音乐对情绪的长期影响的研究并不充分。
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