And he who is versed in the science of numbers can tell of the regions of weight and measure, but he cannot conduct you thither.
精通数理的人，可以向你讲述度量与衡量的天地，却不能把你带到那里。
— Kahlil Gibran · The Prophet (1923) · On Teaching —
键盘照着敲一遍，更容易记住。
不用找输入框，直接敲键盘。