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Millions of fertilized eggs are released, cast into the ocean currents...
数百万个受精卵释出后 卷入洋流中
..and straight into a dangerous world.
直接进入一个危险的世界
Whale sharks, the largest fish on Earth.
鲸鲨是地球上体积最大的鱼类
Each shark might weigh ten tonnes
每条鲸鲨可能重达十公吨
yet they feed on the tiniest creatures, including snapper eggs.
却靠最渺小的生物维生 包括笛鲷卵在内
Life is being created, sustained and destroyed simultaneously
生命的创造，维系和毁灭 都在一场大规模活动中
in one huge event.
同时进行
The struggle for life, encapsulated into a single moment.
生存的挣扎全都浓缩在顷刻之间
The oceans are perilous places to live,
海洋这个生活环境危险重重
yet fish have developed the most extraordinary means for survival.
然而鱼类为了生存 发展出种种最奇特的手段
Their astounding diversity,
林林总总的品种令人咋舌
the product of millions of years of evolution,
这是数百万年来演化的成果
has enabled them to triumph.
让它们克敌制胜
Dominating the one habitat
主宰了这一个
that we have so far failed to make our own.
人类至今无法夺取的栖息地

重点解释

Millions of fertilized eggs are released, cast into the ocean currents.....and straight into a dangerous world.数百万个受精卵释出后，卷入洋流中直接进入一个危险的世界

millions of成百万的, 许许多多的

There are millions of living things on the earth.

世界上有数以百万计的生物。

There were millions of people in the square.

广场上有好多好多人。

cast into铸成(铸型)

Life is cast into etemity at that casual instant.

生命就是在那不经意的瞬间凝为永恒。

yet they feed on the tiniest creatures, including snapper eggs.却靠最渺小的生物维生包括笛鲷卵在内

feed on 用 ... 喂养； 靠吃 ... 过活； 以 ... 为能源

Silkworms feed on the leaves of mulberry.

蚕吃桑叶。

Bats fly at night and feed on insects.

蝙蝠在夜间飞行，以昆虫为食。

the product of millions of years of evolution, has enabled them to triumph.这是数百万年来演化的成果让它们克敌制胜

enable:常使用在使某人做某事的结构上(enable sb to do sth)

He invented a machine to enable people in wheelchairs to get up stairs.

他发明了一个机器可以使坐在轮椅上的人站起来。