我们需要吸取教训和终结经验，英文翻译下

We must learn the lesson and sum up the experience

We shall/should(2选1) learn from the lessons and summarize such experience.

直译：
We need to gain experiences and learn lessons (from our work).
（括号中加了一点，使句子显得更完整。）

英语中在总结经历的时候，会说lessons leaned，其实就包含了经验与教训。
因此更常见的说法：
We need to learn lessons from our experiences/work.

供参考。