A penny earned is a penny saved.
就是说做不善的事情要受到惩罚,做善事会得到奖赏。
The desert teaches you to appreciate the smallest things in life.
世界是一本书,不旅行的人只读了一页。
The expanded concept of art is necessary.
奈奎斯特准则提供了一种图形方法来确定闭环系统的稳定性。