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Lorde, Imagine Dragons Lead Billboard Awards Nominations 梦龙Lorde领跑2014公告牌音乐奖提名 Welcome to American Mosaic from VOA Learning English. Im June Simms. Today on the show: We play music from the just announced nominees for 2014 Bil

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科学美国人60秒 SSS Color-Changing Skin Aids Climate Control and Communication

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