Surprislngly, it isn't something huge which allows these giant herbivores to grow big enough to be all but invincible.

令人惊讶的是，并不是巨型的尾部使得这些庞大的食草动物长成无人能敌的巨兽。

To be able to digest this huge volume of food and grow big enough to avoid attack requires a stomach as large as a ton.

为了消化如此多的食物长成庞然大物、躲避攻击需要一个一吨重的胃。

It often grows in conditions so dirty it requires constant antibiotics and other chemicals just to grow big enough to eat.

现在鱼的生存环境是如此之差，以致于为了让鱼长得更大些，人们需要持续的喂食抗生素和其它化学药品。