常見例句雙語例句Why doi birds fly south?鳥為什么往南飛?。Why do birds fly south?鳥為什么往南飛?。www.zk168.com.cnWhy do birds fly south for the winter?為什么鳥兒在冬天的時候飛往南方?blog.sina.com.cn原聲例句Birds fly south because they know winter is coming. 返回 birds fly south