BBC听力 | 冰雪世界 04
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First though valuable nesting places
来之不易的孵化地
must be defended from property thieves
最重要的是要防止窃贼
After laying their eggs
下完蛋之后
take time out to clean their plumage the petrels
会抽出时间把羽毛清理干净
The south polar skua is a formidable opportunist
灰贼鸥是一种强大的投机分子
but the skuas have not chanced upon the petrels
但贼鸥对雪鹱从不主动出击
they've been waiting for them
而是等待它们的到来
These birds do not need to go to the ocean for their food
它们不需要费力地到海洋里去寻找食物了
The skuas can survive further south than any other predator
贼鸥可以比其他肉食动物生存到更南边
by exploiting the petrels' desperate need for bare rock
通过利用雪鹱极度渴望的裸露的岩石
Even at the height of summer
即使是在盛夏
less than 3% of Antarctica is free of ice
南极也只有不到百分之三的地方没有冰雪覆盖
and nearly all of that exposed rock
而且几乎所有露出的地面
is found in one place - the Antarctic Peninsula
只集中在一个地方——南极半岛
Its long arm extends further north than the rest of the continent
这块地方像一只向温带伸出的长臂
so spring arrives here first
所以这里的春天来得最早
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