per-,完全的，-tin,抓住，握住，词源同contain,continent.引申词义坚决的。

1. I can affirm that he is tenacious and pertinacious as are few.

我可以肯定,像他那样不屈不挠、百折不回的人是十分罕见的.

2. Questions buzzed in his head like pertinacious bees.

一连串问题在他脑子里盘旋着,就象纠缠不休的蜜蜂.

3. He had been driven into a corner by the pertinacious ingenuity of Miss French.

弗伦奇小姐的再接再厉的巧妙手腕逼得他一点办法也没有.

4. The ideas of my friend Watson, though limited are exceedingly pertinacious.

我朋友华生的某些想法虽然为数有限,却是执拗得出奇.

5. Objective To study the etiology of pertinacious chronic cough in children.

目的探讨小儿难治性慢性咳嗽的病因.