The deepest problems in mathematics often arise from the simplest questions.
The unexamined life is not worth living.
A woman must have money and a room of her own if she is to write fiction.
采礦業(yè)的創(chuàng)新不是可選項，而是生存必需。
函數(shù)是一種對應(yīng)規(guī)則，通過它當給定任何東西（作為參數(shù)）時，可以獲得另一個東西（該參數(shù)的函數(shù)值）。