这句短语(英文) 怎么把握?

问题描述:

这句短语(英文) 怎么把握?
She offered to take the responsibility as the schoolmaster.
offer to 怎么把握?同样是当校长,加上offer to 有什么区别?
请赐教.

offered to = 自愿、志愿、自告奋勇