1. cling to

坚持，保留，不放弃

They know scholars reject their legend, but they still cling totheir belief.

尽管知道学者们不相信他们的传说，他们还是坚持自己的信仰。

2. insist on

坚持要求，一定要求做某事

We'll insist on discussing this issue.

我们将抓住这个问题不放。

3. keep on

坚持，继续

I have never won anything yet，but I intend to keep on trying until I do.

我未曾取得过好成绩，我打算坚持下去，直到成功。

4. persevere in/with/ at

坚持，固守。强调的是坚韧不拔，孜孜不倦。

Despite a number of setbacks, they persevered in their attempts to fly around the world in a balloon.

虽屡遭挫折，他们仍不断尝试乘气球环游世界。