公司员工的辛勤贡献使项目提前完成。

The employees' hard work and ___contributions led to the project's early completion.

他的研究对解决这个问题做出了重要贡献。

His research made significant ___contributions to solving this problem.

这本期刊每年收到来自世界各地的数百篇投稿。

The journal receives hundreds of ___contributions from around the world each year.