我自告奋勇去报名参加800米长跑。

I volunteered to enrol in the 800 meters race.

youdao

于是我自告奋勇，对黄先生的讲话作了更全面、更准确的描述。

So I chimed in and added a fuller and more accurate account of what Mr. Huang had actually said.

youdao

我自告奋勇地上了其中的一个划子，当然，我并没有多少事可做。

I volunteered for one of the boats, where I had, of course, no business.

youdao