And when the system fails, it is my responsibility." President Obama campaigned on a promise of "change we can believe in."

VOA: special.2010.01.23

So it is my promise to you and it is the huge staff's promise to you that we will absolutely get you through this course and you will have a good time doing so.

所以我对你们承诺，也是所有教员的承诺：,你们绝对能够通过这门课程,并且在课程中度过一个愉快的时光。

哈佛公开课 - 计算机科学课程节选

I promise that what I have told you today is true C cross my heart.

VOA: special.2010.07.11

And if you don't kill us I'll do my best to protect you.'" Swan has kept the promise, his eyes opened to environmental problems made worse by a warming climate.

VOA: standard.2009.12.10