lǎo / shī / yāo / qiú / wǒ / men / shuō / míng / wèi / shén / me / jī / fēn / cháng / shù / bù / néng / shěng / lüè

老师要求我们说明为什么积分常数不能省略。

The teacher asked us to explain why the constant of integration cannot be omitted.