因为鸟们里，麻雀最笨，没有三弯两转，又不会自己做窝，总是钻进房屋的洞隙里，瓦缝椽缝中。
O O B-Thing I-Thing O O B-Thing I-Thing O O O O O O O O O O O O O B-Thing I-Thing O O O O O O O B-Location I-Location I-Location I-Location I-Location I-Location O B-Location I-Location I-Location I-Location I-Location O