英语听力：自然百科 大堡礁 堡礁内外(9)

（单词翻译）

 They are one of the ten species of whales that visit the reef each year.

座头鲸是每年造访大堡礁十种鲸鱼当中的一种。

They were once hunted almost to extinction¹, but numbers here have bounced back to 15 thousand, about half the pre-whaling population.

它们曾遭受大肆捕猎，几乎处于绝迹，但现在数量已经回升至15000只，这个数字是捕鲸业开始之前数量的一半。

Like Minkes, humpbacks come up from the Antarctic to mate and to calve.

和小须鲸一样，座头鲸也是从南极来这里进行交配分娩。

This mother gave birth a couple of weeks ago.

这头母鲸数周前产下幼鲸。

And already her calf² weighs over two tons and it is more than six meters long.

她的小宝宝已经有2吨多重，身长也超过6米。

For the turtle mother, the final and what may turn out to be the most arduous³ part of her journey has only just begun.

对海龟妈妈而言，此行途中最后也可能是最为艰辛的部分只不过刚刚开始。

With thousands of turtles arriving at the same time, their trails crisscross the sand like tank tracks on a battlefield.

数千只海龟同时抵达，它们在沙滩上的痕迹纵横交错，就像战场上坦克过后留下的痕迹。