I owe a debt of thanks to Joyce Thompson, whose careful and able research was of great help.

我欠乔伊斯·汤普森一份感谢之情，他谨慎杰出的研究是极大的帮助。

The English-Chinese dictionary my father bought for me many years ago is still of great help.

我父亲多年前给我买的英汉词典仍然很有用。

I recommended buying an English-Chinese dictionary, which I thought would be of great help to your study.

我建议你买一本英汉词典，我认为它会对你的学习有很大的帮助。

You're a great help, I must say!

我得说，你可没少帮忙！

You've been a great help.

你帮了大忙。