But as far as the business letters are concerned, the addresser should grasp two more principles during the process of letter writing: completeness and concreteness.
But as far as the business letters are concerned, the addresser should grasp two more principles during the process of letter writing: completeness and concreteness.
但就商务书信而言，写信人在写商务书信时还需要多掌握两条原则：完整和具体。