and that social norm is just something that's changed over time." And people share a lot.

VOA: standard.2010.07.23

And it's just very hard to change something that hasn't changed very much.

但是不经常改变的事物,想要改变是很难的。

斯坦福公开课 - 戴尔CEO-Michael.Dell谈创业和发展课程节选

How can something be changed utterly?

怎样才能彻底改变呢？

耶鲁公开课 - 现代诗歌课程节选

Also,for industry, salt in the composition of food products,is something that cannot be changed overnight.

VOA: standard.2010.04.22

"And we are going forward and we will come out at the end of October, beginning of November, with this new approach because something has to be changed."

VOA: standard.2010.06.29