在国际贸易中，必须确保商务英语信函的正确性，清晰性，逻辑性和礼貌性。
In international trade, the business English letter must be accurate, clear, logical and polite.
商务英语信函是国际商务活动的重要手段。
English business letters are important means for international business activities.
商务英语信函是国际商务活动的重要手段。
English business letters are important means for international business activities.
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