You use quite to indicate that something is the case to a fairly great extent. Quite is less emphatic than 'very' and 'extremely'.
I felt quite bitter about it at the time.
当时我对此感到相当痛苦。
Well, actually it requires quite a bit of work and research.
呃,实际上这需要相当多的工作和研究。
You use quite to emphasize what you are saying.
It is quite clear that we were firing in self defence.
情况非常明了,我们当时是自卫还击。
My position is quite different.
我的立场完全不同。
You use quite after a negative to make what you are saying weaker or less definite.
Something here is not quite right.
这儿有什么不太对劲儿。
You can say quite to express your agreement with someone.
'It's your choice, isn't it?'—'Quite.'
“这是你的选择,不是吗?” “可不是嘛。”
You use quite in front of a noun group to emphasize that a person or thing is very impressive or unusual.
'Oh, he's quite a character,' Sean replied.
“哦,他真是一个不同寻常的人。”肖恩答道。