非得

If you want to get any essays out of those lazybones, they have to be kept after.

你要想让那些懒家伙写什么文章, 就非得盯住他们不可。

It is a labor to task the faculties of a man — such problems of profit and loss, of interest, of tare and tret,(8) and gauging of all kinds in it, as demand a universal knowledge.

这真是一个辛苦劳役，考验着一个人全部官能，——这些赢利或损失问题，利息问题，扣除皮重计算问题，一切都要确实数字，非得有全宇宙知识不可啊。