释义：
be a great (big) help (to) （对某人）产生巨大的帮助
在得到巨大帮助之后，用来表达内心感激之情。经常会用现在完成时，You're been a big (great) help （您给予了我巨大帮助）。
例句：
Thanks. You've been a great help.
谢谢，你给了我巨大的帮助。
He was a big help to us, as always.
他对我们帮助很大，每次都是。
You're a big help. I think I can't live without you.
非常感谢，我不敢想象没了你应该怎么活。
Thank you. You've been very helpful.
很感谢，你给了我巨大的帮助。
对话：
A: I see there is a new secretary in the office.
我看见办公室里来了一位新秘书。
B: Yes, she is a great help to all of us.
恩，她对我们帮助很大。
