2. We start with the function that uses the naive formula in textbook format. 我们使用教科书般的公式格式来讲解第一个函数。
3. The stupid neither forgive nor forget; the naive forgive and forget; the wise forgive but do not forget. 愚蠢的人既不原谅也不忘记；天真的人原谅、忘记聪明的人原谅，但不忘记。
英英解释
adj.
1. marked by or showing unaffected simplicity and lack of guile or worldly experience
2. of or created by one without formal training; simple or naive in style
3. inexperienced
4. lacking information or instruction
5. not initiated; deficient in relevant experience
