答案是:Dear Prof.Robin, I am writing on behalf of the English Department to invite you to give a lecture in our college. We know that you are an expert on British literature.We would be very grateful if you could give a lecture on"Contemporary.British Literature"to the English Department on Sunday,April 8. If this subject does not suit you,any other similar topic would be welcome as well. We sincerely hope you can come.If it is convenient for you,would you please drop me a line to let me know whether you can come or not?.We could be looking forward.to the opportunity to benefit from your experience and wisdom. Sincerely yours, Thomas Johnson
