白键代表快乐，黑键代表悲伤。
The white keys represent happiness, while the black keys represent sadness.
可以在钢琴的黑键上演奏。
巴林弹钢琴无师自通﹐但是只会弹黑键。
Israel taught himself to play the piano. But he could play only the black keys.
这黑键摁下去不响。
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.
黑键是悲伤。
黑键是悲伤。
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