重点词汇
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信件
letter; mail; correspondence; missive
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开头
begin; start; outset; opening; beginning; lead-off; at the beginning
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客套话
polite expressions/formulas/remarks
A polite remark at the beginning of a letter
信件
letter; mail; correspondence; missive
开头
begin; start; outset; opening; beginning; lead-off; at the beginning
客套话
polite expressions/formulas/remarks