subject: IntroductionDear Mr. / Ms.,This is to introduce Mr. Frank Jones, our new marketing specialist who will be in London from April 5 to mid April on business.We shall appreciate any help you can give Mr. Jones and will always be happy to reciprocate.Yours faithfully,Yang Ning尊敬的先生/女士，现向您推荐我们的市场专家弗兰克琼斯先生。

他将因公务在四月五日到四月中旬期间在伦敦停留。我们将非常感谢 您向琼斯先生提供的任何帮助，并非常愿意回报您的帮助。您诚挚的杨宁