原文视听

When their new armour has hardened,
当新壳变硬
the crabs return to the comparative safety of the deep,
蜘蛛蟹就回到较安全的海底
leaving behind only their old, empty shells.
只留下它们褪下的旧空壳
Like spider crabs, the behaviour of most marine creatures
跟蜘蛛蟹一样 多数海洋动物的行为
is controlled by a very simple nervous system.
都是由简单的神经系统控制
But there are exceptions.
但还是有例外
This cuttlefish is one of the cleverest animals in the ocean.
这只乌贼 是最聪明的海洋动物之一
She has a very large brain.
这只母乌贼有很大的脑部
In fact, it's larger for her size
根据身体比例
than that of most fish or reptiles.
它的脑部 比多数鱼类或爬虫类更大
Her life is both complex and full of intrigue.
它的生活不只复杂，更充满谜题
Giant Australian cuttlefish usually live alone,
澳洲巨乌贼通常独来独往
but once in their short lives they must come together to mate.
但在短暂的生命中 它们必须聚集一次进行交配

重点解释

In fact, it's larger for her size than that of most fish or reptiles.根据身体比例它的脑部比多数鱼类或爬虫类更大

in fact事实上；实际上；确切地说

He doesn't mind. In fact, he is even pleased.

他不介意，事实上，他甚至很高兴。

In fact, I think an old car is better than none.

事实上，我认为有一辆旧车总比没车强。

Her life is both complex and full of intrigue.它的生活不只复杂，更充满谜题

full of充满 ...

He walked with a stride full of purpose.

他迈着坚定的步伐向前走。

She was full of shame at her bad behavior.

她对自己的不良行为感到羞耻。

Like spider crabs, the behaviour of most marine creatures is controlled by a very simple nervous system.跟蜘蛛蟹一样，多数海洋动物的行为都是由简单的神经系统控制

control by被...控制

Should industry be controlled by the state?

工业应该由国家控制吗？

Grain imports are controlled by strict quotas.

谷物进口量受最高限额的严格控制。