求翻译：本文第一部分介绍了商务信函的研究意义，着重强调了商务信函在日常的商务活动中扮演着不可替代的重要的角色，并且对于双边贸易的顺利开展与进行有极大的促进作用。是什么意思？

The first section describes the significance of business letter, emphasis on business correspondence plays an irreplaceable important role in the day-to-day business activities, and the smooth development of bilateral trade and a great role in promoting.

This article describes the first part of the business correspondence, research focuses on the business letter in Everyday Business Activities plays an irreplaceable role in bilateral trade, and the smooth and a great role.

The this article first part introduced the commercial correspondence research significance, emphasized emphatically the commercial correspondence is acting the important role in the daily commercial activity which cannot be substituted, and with carries on regarding the bilateral trade smooth develo

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