商业信函写作是商业活动中的必不可少的一个环节。
Business letter writing is one of the necessary business activities.
外贸商业信函写作应把握三个原则：礼貌、简洁、明确。
Politeness, clearness and conciseness are the essentials of good business writing.
就像商业信函、大学报告与论文一样，音视频脚本的编写也要遵循一些写作准则与规范。
Just like business letters, college reports and essays, guidelines and rules govern the writing process.
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