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Ours is truly a blue planet.
地球确实是个蓝色的星球
Water covers most of the world's surface.
地表大部分被水覆盖
Here we are the outsiders.
这里不是我们的地方
But under the waves one group thrives.
但有一群生物 在海浪下蓬勃发展
Fish.
鱼类
Fish are masters of the waters.
鱼类是水中之王
And sailfish are the fastest of them all.
其中以旗鱼的速度最快
Their speed makes them one of the ocean's most fearsome predators.
它们靠速度成为 海洋最恐怖的掠食动物
Off the coast of Mexico,
在墨西哥外海
30 sailfish have surrounded a ball of sardines.
三十条旗鱼包围了一群沙丁鱼
To catch their prey requires more than speed alone.
要捕捉猎物不光要速度快而已
In the tightest turns, fins maintain stability.
即使最迫切的急转弯 鱼鳍依然稳如泰山
Their sickle-shaped tail powers them forwards
它们靠镰刀状的尾巴向前推进
and that extraordinary dorsal fin helps intimidate their prey.
独树一格的背鳍 帮它们恫吓猎物
To the naked eye, the action is too fast,
动作太快 肉眼看不见
slowed, their challenge becomes clear.
变成慢动作 就明白它们面对了什么挑战
Just picking a target is hard enough.
光是挑选目标就够棘手了
Knocking it off balance, separates it from the shoal.
让猎物失去平衡和鱼群分开
This requires extraordinary skill.
可需要不同凡响的技巧

重点解释

30 sailfish have surrounded a ball of sardines.三十条旗鱼包围了一群沙丁鱼

a ball of:一团

The car was engulfed in a ball of flames.

汽车陷于一团火球中。

People consider me a ball of energy!

人们认为我是能量球!

To catch their prey requires more than speed alone.要捕捉猎物不光要速度快而已

more than:不只是；很；超过

We know more than you do.

我们比你知道的多。

He needs me more than ever.

他比任何时候更需要我。

Knocking it off balance, separates it from the shoal.让猎物失去平衡和鱼群分开

knock off:<非正>降低；<非正>将…击打掉

He has knocked 10 seconds off the world record...

他将世界纪录缩短了10秒。

My health compels me to knock off work.

我的健康状况迫使我不得不停止工作。

separate from:从...分开

Violent prisoners are kept separate from the others.

有暴力行为的囚犯隔离囚禁。

Korea is separated from China by the Yalu River.

朝鲜和中国只有鸭绿江一水之隔。