Each reference photograph is identified with the proper number and letter designation.
每一参考照片用特定的字母和数字标识。
When you acknowledge a letter, refer to the date, subject and reference number.
当你确定一封信时，应该注意日期、主题和信函编号。
When you acknowledge a letter, refer to the date, subject and reference number.
当你确定一封信时，应该注意日期、主题和信函编号。
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