第一，迷你对话

A: I decide not to buy the mobile phone.

我决定不买手机了。

B: But you told me yesterday you would.

但是昨天你说你买的。

A: I have changed my mind.

我改变主意了。

B: What's wrong?

怎么了？

A: My family doesn't back me up at this point. They think it is useless to me now as a student.

我家人在这件事情上不支持我，因为他们说我现在还是一个学生，手机对我没用。

第二，地道表达

back up

1. 解词释义

Back up是“支持”的意思。

2. 拓展范例

E.g. His employers, Norfolk social services, backed him up.

他的雇主——诺福克社会服务中心给予了他支持。

E.g. We firmly back up the just struggles of the oppressed people of the world.

我们坚决支持世界被压迫人民的正义斗争。

第三，好词妙语

1. at this point：这时候，此时此刻

E.g. I will not recommend you for promotion at this point.

目前，我不会建议对前晋升。

E.g. At this point, I will be willing to expend a little effort to learn more.

这时，我愿意花一些精力来学习。

2. change one's mind：改变想法

E.g. He perceived that he could not make his daughter change her mind.

他知道他无法改变女儿的心意。

E.g. I hope you wouldn't chop and change your mind so often.

我希望你不要总是反复无常。