make a contribution to doing sth与make cont

Question

make a contribution to doing sth与make contmake a contribution to doing sth与make contributions to doing sth分别是什么意思？

Answer 1

问题：make a contribution to doing sth与make contmake a contribution to doing sth与make contributions to doing sth
翻译答案：做某事做贡献与做某事使contmake贡献与做某事做出贡献
分别是做某事

Answer 2

都是在做某一方面有建树或者说对什么事情做出过贡献的意思