英语听力：自然百科 大迁徙之繁衍生息 Need to Breed—11

 Almost magically, they form a temporary nest of their own bodies. The larvae¹ and food are taken into the nursery at its centre. Tomorrow they will do the whole thing again, marching for two to three weeks to reach fresh hunting grounds, where they can set up another raiding base and reach new heights of slaughter².

On migration³ central, the Falkland Islands, the multitudes are busy multiplying .Female elephant seals barely escape the male's attentions long enough to give birth to pups conceived here last year. In the brief three weeks, the pup has with its mother. Its body weight will triple, as hers shrinks by a third. A bull moves in soon after the birth to impregnate her again. Each beach master on the shores may have dozens of females in his harem, and one hundred matings to complete in less than a month, all the while, having to fight off more and more challengers.

 

1 larvae   

n.幼虫

参考例句：

• Larvae are parasitic on sheep.幼虫寄生在绵羊的身上。
• The larvae prey upon small aphids.这种幼虫以小蚜虫为食。

2 slaughter   

n.屠杀，屠宰；vt.屠杀，宰杀

参考例句：

• I couldn't stand to watch them slaughter the cattle.我不忍看他们宰牛。
• Wholesale slaughter was carried out in the name of progress.大规模的屠杀在维护进步的名义下进行。

3 migration   

n.迁移，移居，（鸟类等的）迁徙

参考例句：

• Swallows begin their migration south in autumn.燕子在秋季开始向南方迁移。
• He described the vernal migration of birds in detail.他详细地描述了鸟的春季移居。