中译英：我想说的是，在奥运会上做志愿者对于年轻人是有意义的事。

What I want to say is that it's meaningful for the young people to be volunteers in the Olympic Games.

中：我想说的是，在奥运会上做志愿者对于年轻人是有意义的事。
英：I would like to say that in the Olympic Games for young volunteers to do is meaningful.

What I want to say is that to be a volunteer in Olympic Games is such a meaningful event for young people.