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可可英语每日一句口语：
Life is like a piano:white keys are happy moments and black keys are sad moments. But remember both keys are played together to give sweet music.
生活就像一架钢琴：白键是快乐，黑键是悲伤。但是，要记住只有黑白键的合奏才能弹出美妙的音乐。
【知识点讲解】
both adj.二者，两者都
例句：
He had to have both legs amputated.他不得不锯掉双腿。
