"AD 1189, Prince Gong Song Guangzong first sealed, then Jidi Wei, claiming that" double happy "or Christine the state government of Chongqing, Chongqing, hence the name, dating back over 800 years."

公元1189年，宋光宗先封恭王，后即帝位，自诩“双重喜庆”，升恭州为重庆府，重庆由此得名，距今已有800余年。

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When two couples go out together, we call it double dating.

当有两对恋人一起出去时，我们称之为“结对约会”。

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"Double spike" isotopic dating method of lead isotope is one of the dating ways of lead isotope, its aim is to correct mass differentiation effect and enhance the precision of measure.

铅同位素“双稀释剂”同位素定年法是当前应用较广的一种铅同位素定年方法。双同位素稀释法的目的在于校正质量鉴别效应，提高测定精度。

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One of his first, and most unpopular, acts was to scrap the much-loved but decrepit fleet of Routemaster double-decker buses, dating from the 1950s.

CNN: London mayoral election: Battle of the buses

Another black seventh grader who participated in the study, 13-year-old Chantay, admitted she, and others in her extended family, had a double standard regarding interracial dating.

CNN: STORY HIGHLIGHTS