没有了猫的威胁，仙女般的燕鸥又返回到岛上。 但不像其祖先那样栖息在峭壁上，她们在大树的枝叶间开始了自己的新生活。
Free from the threat of cats, fairy terns have returned to the island—and forsaken their ancestral cliffs for a new life among the leaves and branches.
图：绿色线路为秋季燕鸥南迁路线；红色线路为其冬季飞行路线；黄色线路为春季燕鸥北飞路线。
See map at right: Green represents autumn/southward migration; red denotes winter range; and yellow represents spring/northward journey.
战国期间(公元前5世纪- 221年)，齐、燕、赵修建大量城墙保卫其边境。
During the Warring states Period (5th century BC-221 BC), the states of Qi, Yan and Zhao all constructed extensive fortifications to defend their own borders.
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