—— 请按键盘 空白键 开始游戏 ——

The notion of a function is fundamental in mathematics, and the λ-calculus provides a way to formalize this notion.
函数的概念在数学中是基础的,而λ演算提供了一种形式化这一概念的方法。
The most valuable resource in any company is its people—invest in them wisely.
The hardest decisions often yield the greatest rewards.