Pigeons wandered unconcernedly about the concourse seeking the old crumb here and there while round them the tide of commuters ebbed and flowed.

• 广场上上下班的过往旅客蜂拥如潮，而鸽子却无惧无恐地在人流之间大摇大摆地走来走去，到处觅食面包屑。