This is more like it! Real food—not that canned muck.

这就是了！真正的食物—而不是那种罐装的垃圾食品。

《牛津词典》

It is quality not price that sells our products.

我们的产品销路好，靠的是质量，而不是价格。

《牛津词典》

It is not often that you get such an opportunity.

你得到这样的机会，可不是常有的事。

《牛津词典》

It is not always clear that eating something as harmless as wheat can be bad for a person's health.

VOA: special.2010.06.15

Their argument is that it's not just that consciousness doesn't clearly understand what it's looking at and is therefore alienated from it.

他们的论点是,意识不仅无法清楚地理解它所观之物,因而与之疏远。

耶鲁公开课 - 文学理论导论课程节选

when you feel upset or when you feel frustrated that something is not going the way that you wish it would.

当你觉得很失落，或者当你因为事情不像你期望的那样进展而感到沮丧时，你也可以使用这个句型。

I'm frustrated 课堂 - SpeakingMax英语口语达人

Or is it not that simple?

BBC: Stimulus - the Welsh, Scottish and Westminster way

And despite the competitive concerns it raises, the telecoms business is changing so quickly that it is not clear that it should.

ECONOMIST: A high-wired act

The puzzle about the British economy is not that it is doing badly but that it is not doing worse.

ECONOMIST: The economy