Blue can also represent sadness.
蓝色也表示难过；
The white keys represent happiness, while the black keys represent sadness.
白键代表快乐，黑键代表悲伤。
The white keys represent happiness and the black shows sadness.
白色琴键代表幸福，黑色琴键代表悲伤。
The white keys represent happiness and the black shows sadness.
白色琴键代表欢乐，黑色琴键代表忧伤。
Life is like a piano. The white keys represent happiness and the black shows sadness.
生活就像一架钢琴，白键代表幸福，黑键表示悲伤。
Life is like a piano. The white keys represent happiness and the black shows sadness.
生活就像一架钢琴，白键代表幸福，黑键表示悲伤。
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