Mathematics is the music of reason.
以孩子們能理解的方式寫一些困難的主題是很重要的。
科學(xué)是理解世界，而工程是改變世界。
A journey is a person in itself; no two are alike. And all plans, safeguards, policing, and coercion are fruitless. We find after years of struggle that we do not take a trip; a trip takes us.