疼痛不仅仅是一种感觉;它是一种复杂的生物反应,告诉我们某些地方出了问题。
Every book is a quotation; and every house is a quotation out of all forests, and mines, and stone quarries; and every man is a quotation from all his ancestors.
Mathematics is not just a collection of abstract theories, but a language that describes the universe.