A: I decide not to buy the mobile phone.
B: But you told me yesterday you would.
A: I have changed my mind.
B: What's wrong?
A: My family doesn't back me up at this point. They think it is useless to me now as a student.
E.g. His employers, Norfolk social services, backed him up.
E.g. We firmly back up the just struggles of the oppressed people of the world.
1. at this point：这时候，此时此刻
E.g. I will not recommend you for promotion at this point.
E.g. At this point, I will be willing to expend a little effort to learn more.
2. change one's mind：改变想法
E.g. He perceived that he could not make his daughter change her mind.
E.g. I hope you wouldn't chop and change your mind so often.