The stegosaurus, a giant dinosaur that grew to more than 18 feet long and was armed with enormous bony plates on its neck, back, and tail, had a brain that weighed only 2 ounces and was no bigger than a walnut.
一种叫做剑龙的大型恐龙能长到18英尺长，全身的颈部、背部和尾部都长有骨片。可是它的脑子仅有2盎司重，只有胡桃那么大。
