学习一门语言很难，但你必须坚持下去。

Learning a language is hard but you've just got to ___keep ___at it.

尽管这需要耐心，但人们不应该让自己陷入疯狂，而是要坚持下去。

Despite the fact that it requires patience, one should not work oneself up into a frenzy but ___keep ___at it.

要在这个项目中成功，你必须尽管有挑战也要坚持研究。

To succeed in this project, you must ___keep ___at the research despite the challenges.