可以是每次乘车都必听的一首歌，一个傻傻的握手或者是没人能懂的手势，或者是只有你俩的一周一次的活动。
That could be a song you belt out on every car ride, a goofy handshake or gesture that no one else understands, or a weekly ritual just for the two of you.
一首歌就只有一首。
举例来说，假如一首歌只有鼓、低音吉他、吉他与钢琴，那它便是由四种不同的乐器组合而成。
For example, of a song were to have drums, bass, guitar and a piano that would then constitute as four distinct instruments.
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