以下为句子列表：
英文: Business letters are usually formal, but we write in an informal way to family members or friends.
中文: 业务/商业信件通常都是讲究格式的,但我们给家人或朋友写信就比较随便了。
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英文: Business letters are not usually written in conversational style.
中文: 商业信件通常不会用会话文体写。
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英文: Business letters are usually formal,
中文: 商业信件通常都是讲究格 式的,
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英文: Business letters must always be formal, but we should write in a natural way to friends.
中文: 商业信函必须是正式的，但是写信给朋友应写得自然一些。
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英文: 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.
中文: 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。
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