英语听力：自然百科 大迁徙之繁衍生息 Need to Breed—3（在线收听）

 From tip to tip, its wings stand eight feet. This superb blighter can soar almost e* 24 hours a day. Waiting in this bustling, the troublous of hundreds of thousands of birds, her mate shores up the nest from last year's breeding. And after seven lonely month, and tens of  thousands of miles riding the southern sea winds, they share an ecstatic restating of vows. Their bond may last 30 years. Up and down the shores, nests are being tended to bonds renewed, and eggs laid. For the next two months, the couple has only one goal, to keep the egg alive.