It was the size of a postage stamp and just as thin, and was a thin covering around their walnut-sized brain, but it was capable of a new type of thinking.
皮质尺寸像邮票一样而且很薄， 这个薄的皮质包裹着他们 像核桃大小的头脑。 但它可以产生新的思维方式。 不像那些非哺乳类动物，