She had no appreciation of the difficulties we were facing.

她不了解我们所面临的困难。

We don't know all the circumstances, so it would be pointless to speculate.

我们不了解所有的情况, 妄加推测没有意义的。

He gave us a warning against placing confidence in people we did not know.

他告诫我们, 不要轻信我们不了解的人。

They were not blinded to the defects of Western society.

他们并非不了解西社会的缺陷。

One unversed in such matters can have no notion of the many and tragic things that can happen to a chicken.

不了解养鸡的人很难想象一只鸡会遭遇多少灾难。

Show an interest in other people, but don't discuss anything that you wouldn't talk about with your grandmother or religious officiant -- especially with a coworker you don't know extremely well.

对人表示感兴趣，但不要谈论那些你不会祖母或宗教主祭谈论的话题，特一位你了解并不深的同事。