It is within my power.

那是在我的权力以内。

《新英汉大辞典》

I will do everything in my power to help you.

我将尽全力帮助你。

《牛津词典》

I know I shall never be able to repay you, but what is in my power I shall do.

我知道我永远也无法报答你，但只要我力所能及，我就一定会做。

youdao

"Do not doubt my power. I am ready to make this cheek as perfect as its pair."

VOA: special.2009.09.26

Or Augustus--he had taken the title Augustus by this time, which means "the great"--he himself said, "I transferred the Republic from my power to the dominion of the Senate and the people of Rome."

或者奥古斯都。。。当时他已经使用了这个头衔，意思是“尊崇“，他说，“我已将共和国重还给,元老院及罗马人民统治“

耶鲁公开课 - 新约课程节选

How do I give up my right to do whatever is in my power to secure my person or my possessions, when I have no expectation, you might say, ? that others around me are prepared to do so as well?

我怎么能在我不期望,身边的人会这样做的时候，放弃我保护自身和财产安全，不受侵害的权利？

耶鲁公开课 - 政治哲学导论课程节选

"I will do everything in my power to be world number one, " said Ferrero.

BBC: Roddick takes top spot

If Ingrid ran for President, I would do everything in my power to support her.

FORBES: PETA's Ingrid Newkirk - A Conversation

"I shall do everything in my power to get him to change his mind, " he said.

BBC: HS2 East Midlands: Call to move phase 2 route