优美的钢琴声每天从那老式的洋房窗户中飘出来，穿过浓密的梧桐树叶，飘荡在空气中。
O O O B-Thing I-Thing O B-Time I-Time O O O O O B-Thing I-Thing I-Thing I-Thing O O O O O O O O O O B-Thing I-Thing I-Thing I-Thing O O O O B-Location I-Location I-Location O