The walls of the educational system must come down. Education should not be a privilege, so the children of those who have money can study.

计算理论的美在于它能够将世界的复杂性抽象成可管理和可理解的模型。

植物油脂肪油的使用在今天看来可能微不足道，但这些油或许会随着时间的推移变得像某些天然矿物油和焦油产品一样重要。