We are in regular communication by letter.

我们定期通信联系。

《牛津词典》

Craft a brief, well-written cover letter to illustrate your professionalism and communication skills. Get your resume read by human resources and secure an interview.

精心制作一个简要的介绍信，封面要书写美观，来表明你的职业化和交际能力。把你的简历给人力资源以便获得一个面试机会。

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Any communication to be made under or in connection with this Agreement shall be made in writing and, unless otherwise stated, may be made by fax or letter.

本协议项下或与本协议有关的任何通信应以书面形式通过传真或信函形式发出，除非另有声明。

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Mr. RUSSERT: But there was a letter written by President Clinton specifically asking that any communication between you and the president not be made available to the public until 2012.

NPR: Clinton No Longer Unscathed Front-Runner