重蹈覆辙【chóng dǎo fù zhé】
follow the same old disastrous road; recommit the same error
[成]重新沿翻车旧辙走,比喻不重视总结经验,记取教训,再犯以前犯过的错误

要从失败中吸取教训,以免重蹈覆辙。
Learn from the failure, and avoid recommitting the same error.
重点【zhòng diǎn】
1. focal point; stress; emphasis 2. important; major; key
[名]1、重要的或主要的 [形]2、重要的或主要的;有重点的

这节课,老师把教学重点放在了古诗的赏析上。
In this lecture, the teacher laid the emphasis on the appreciation of ancient poetry.

今年我侄子考上了重点大学。
This year my nephew was admitted by a key university.
重叠【chóng dié】
1. overlapping 2. duplicate; identical; overlap
[形]1、亦作“重叠”;相同的东西层层相积,形容多 2、重复;雷同

屋瓦是一个压一个地重叠放置的。
Tiles are laid to overlap each other.

这两门课程之间不存在重叠的问题。
There is no overlap between the two courses.