so that, with very little effort, the birds can soar over the city. 游隼不费吹灰之力便可以在城市上空翱翔
are deflected upwards and can help the birds gain height. 有利于游隼飞得更高
These are the only birds of prey that hunt in packs. 栗翅鹰是唯一成群捕食的猛禽
provide a sanctuary for sea birds all the year round. 是海鸟们全年的庇护天堂
There are three million birds on the island, 这个岛上有三百万只鸟
Soon the island is crowded with birds. 很快岛上会到处都是鸟
But even the stormiest waters are no barrier for birds. 但再汹涌的海水都无法阻挡鸟类
and, at last, the mackerel sink below the diving range of the birds. 最后,竹荚鲭也逃出了猛鹱的攻击范围.