How did animals the size of a goat evolve into the largest creatures on Earth?

山羊般大小的动物是如何进化成地球上最大的生物的？

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The world’s largest creatures reside in the ocean, and its depths are home to unusual species whose surprising proportions are unknown on land.

图为栖息在海底的世界上最大的生物，（可以说）深海是不一般的物种的家，它的惊人的大小对于陆面上还是未知。

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That’s the weight of more than 8.6 million full-grown blue whales, the largest creatures on earth. That’s the weight of more than 2.3 million Airbus A380s, the largest commercial planes in existence.

这个重量超过了860万条地球上最大的动物蓝鲸的重量，也超过了230多万架世界上现有的最大的商用飞机的重量。

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These huge creatures are the largest fish in the world.

VOA: special.2009.09.18

This dinosaur family, once common in China, eventually evolved into the largest creatures to ever walk the Earth.

WSJ: Dinosaur Embryos Point to Rapid Growth

Since no dinosaur fossils have ever been found in sediments dating from after this point, conventional wisdom has it that the largest creatures ever to roam the earth must have been cut down in their prime - victims of an asteroid impact that sparked firestorms, acid rain and a nuclear winter that blotted out the sun.

BBC: Closing the 'three metre gap'