"We'll need to wait for all the girls to enter puberty before we have a good grasp on what the contribution is of those environmental chemicals."

VOA: special.2010.08.18

And I think it made a marginal but real contribution to the possibility of normalization of relations there.

我觉得我们的贡献不大，但实实在在,帮助实现了两国的重新建交。

普林斯顿公开课 - 人性课程节选

Consideration is given to an equitable geographical distribution and a candidate's contribution to the maintenance of international peace and security.

VOA: standard.2009.10.15