你帮助我们真的太好了 You helped us really great
你能在业余时间帮助我们解决这个棘手的问题真是太好了，因为我们很难想到和你一样行之有效的办法。
It is kind of you to help us handle this tough problem in your spare time because it is very difficult for us to think of a means as feasible as yours.
你能帮助我们真是太好了。
你帮助我们真是太好了。
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