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Except for one big difference.
兩者只有一個大差別
Like the Meganeura, they're monsters.
他們跟巨蜻蜓一樣是龐然大物，
It's a world full of giants, where millipedes are 6 feet long, and scorpions are the size of wolves.
我們進入了一個巨獸世界，馬陸長兩公尺，蝎子跟狼一樣大，
This is because the oxygen level is much higher than it is today,
這是因為大氣中的氧濃度遠高于今天，
which allows their respiratory systems to be more efficient,
它們的呼吸系統更有效率，
fueling their bodies to grow larger.
身體有更多的成長空間。
So far, animals have been laying their eggs in the water.
至今見過的生物都把卵產在水里，
But a lizard-like creature, called the hylonomus, prefers land.
但是一種叫做樹龍，外形類似于蜥蜴的動物更喜歡把卵產在陸地。
Its eggs contain all the water and nutrients
這些卵含有水和養分，
that the developing fetus needs.
可以滿足發育中樹龍的需要。
The babies grow in their own self-contained pond.
小樹龍在自給自足的池里成長，
The egg is a major evolutionary breakthrough.
這種卵是一種重大演化突破，
Allowing animals to leave the water behind, and conquer land.
動物終于可以離水征服陸地。
This baby hylonomus leads the advance, as a new creature, the reptile.
這只小樹龍將帶隊前進，這是新形態生物，爬蟲類。
Inevitably, with life, comes death.
有生就有死，
Dead plant matter builds up and decays into dense soggy layers.
大量植物死亡，累積腐爛變成密實沼層，
Over hundreds of millions of years, rocks cover these layers.
數億年下來巖石覆蓋這些沼層，
And heat from the Earth's core and pressure from the overlying rocks transform these layers into seams of coal.
地心的熱與上方巖石的壓力把這些死去的植物變成層層的煤，
Each lump of coal burned today is made of plants that died 300 million years ago.
我們現在為取暖供電燒的每塊煤，都是3億年前死去的植物。
