They may play to passers-by in the street or subway so that they can earn some extra money.
他们可能在街上或地铁里为过路者演奏，这样他们可以多挣一些钱。
Sometimes they may play to passers-by in the street or subway so that they can earn some extra money for themselves or to pay for their instruments.
有时他们可能在大街上或地铁里为过路人演奏，这样他们可以为自己或自己要买的乐器多挣一些钱。
Sometimes they may play to passers-by in the street or subway so that they can earn some extra money for themselves or to pay for their instruments.
有时他们可能在街上或是地铁内为过路人演奏，这样他们可以为自己或他们要买的乐器多挣一些钱。
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