听力原文

In late spring, the chilly lake waters are a magnet for breeding birds. The crested grebe woos his mate with offerings of weed for her nest.
晚春时节,寒冷的湖水吸引了很多繁衍的鸟儿，这只冠毛??给它同伴衔来了杂草以此示爱。
Finally the honeymoon suite is ready for action. The grebes are joined by the highest flying birds in the world.
最终，爱巢为它们的蜜月做好了准备。除了??，这里还有世界上飞的最高的鸟。
Having spent the winter south of the Himalayas, bar-headed geese make the hazardous mountain crossing each spring to breed on the plateau's lakes.
斑头鹤在喜马拉雅山的南面过冬。每年春天都要冒险飞越巅峰，到高原的湖泊繁衍生息。
The geese nest together for safety. But so many chicks hatching at the same time means that it can be tricky finding your parents. Fortunately, once down at the water's edge, there's enough food for all of them.
为了安全它们在一起筑巢，但如此多的小鸟同时孵出也就意味着，找到亲生父母是一个很棘手的问题。幸运的是一旦到了水里，就能够找到足够的食物。

重点讲解

重点讲解：
1. be ready for
为……做准备；
eg. The plane is ready for take-off.
飞机准备随时起飞。
eg. The book is ready for publication.
这本书已准备好随时出版。
eg. The goods are ready for shipment.
货物备妥待运。
2. at the same time
同时；
eg. She and I both arrived at the same time by pure coincidence.
我和她同时到达纯属巧合。
eg. Several matters have cropped up at the same time.
几件事挤在一块儿了。
eg. The most common multiple births are twins, two babies born at the same time.
最常见的多胎是双胞胎，两个婴儿同时出生。