reinvent 成语
Reinvent the wheel
If someone reinvents the wheel, they waste their time doing something that has already been done by other people, when they could be doing something more worthwhile.
reinvent
reinvent
reinvent the wheel
1) To do something again, from the beginning, especially in a needless or inefficient effort: “School districts need not reinvent the wheel every time they try to improve their schools” (Washington Post).
2) To recast something familiar or old into a different form: “Call it reinventing the wheel or recasting old ideas, but these contemporary versions have a spirit and style all their own” (New York Times).