70. ---谢谢你带我们到办公室来。
---不用谢，这是我们应该做的。

[误] ---Thank you for guiding us to the office.
---Not at all, it's my duty.

[正] ---Thank you for guiding us to the office.
---Not at all, it's a pleasure. /I'm glad to be of help.

注：汉语的回答实际上是句客套话，如果把它直译为 It's my duty，就会让西方人误以为你并不想帮他，只是因为职责才不得已而为之，这与汉语的愿意有很大出入。所以，恰当的回答应该是 I'm glad to be of help 或 It's a pleasure，其意思是“我很乐意为您效劳”。