学习一门语言需要时间、耐心和重复练习。

Learning a language requires time, patience, and ___repetition.

我们必须尽一切努力避免去年的危机重演。

We must do everything to avoid a ___repetition of last year's crisis.

不从历史中吸取教训，就有重蹈覆辙的危险。

Without learning from history, there is a danger of ___repetition.