原文视听

Now, many miles from their natural home,
现在 家乡已在数英里之外
and in response to an unknown cue,
或许是收到某种未知的信号
they stop and begin to circle.
他们停下来开始围成一圈
Other marine fish that migrate upriver
其他海洋鱼类逆流而上
usually do so in order to breed,
通常是为了繁殖后代
but there's no evidence that these kingfish spawn up here.
但没有迹象表明无鳔石首鱼在淡水河中产卵
Neither do they hunt.
他们也不是来捕食的
So what are they doing?
他们究竟在干什么
In truth, the purpose of this strange behaviour is still unknown.
事实上这种怪异行为的目的至今不为人知
Within a few weeks,
几个星期之后
they will retrace their journey back to the ocean.
他们会沿着来路返回大海
The lives of kingfish,
无鳔石首鱼的生活
like those of turtles and butterflies and pelicans,
与海龟 蝴蝶和鹈鹕一样
are influenced by the Agulhas Current.
都受到厄加勒斯洋流的影响

重点解释

and in response to an unknown cue,they stop and begin to circle.或许是收到某种未知的信号，他们停下来开始围成一圈

in response to回答； 响应

In response to their hospitality, we wrote a thank-you note.

为回报他们的热情，我们写了一封感谢信。

He did it in response to an inner calling.

他受内心欲望的驱使而做了那件事。

Other marine fish that migrate upriver usually do so in order to breed,其他海洋鱼类逆流而上通常是为了繁殖后代

in order to为了

We started early in order to arrive before dark.

为了在天黑前到达，我们很早就动身了。

Let's walk fast in order to keep warm. I'm cold.

咱们快些吧，以保持身体暖和。我感到冷。