奥巴马演讲:2012新年贺词 (1/2)
HINTS
al-Qaeda
科学60秒:黑匣子为安全降落保驾护航
The little black boxes in airplanes provide useful information after a crash has taken place. Now researchers have___1___a way to use black box info from planes that do not___2___—to help preven
科学60秒:神奇油画复原帮手:细菌
A painting that was once a masterpiece can lose its ___1___ after centuries of exposure to the elements. Its true hues may become ___2___ by grime and even buildups of salt. But now researchers i...
科学60秒:多学几国语言可延缓老年痴呆
According to a variety of studies my languages may be providing ___1___ beyond the ability to chat with locals when I travel. Judith Kroll, from Penn State University, discussed findings from ...
金窗
Golden Windows There was a small boy living on a farm, he needed to get up before sunrise every morning to start his chores and out again later to do the evening ones. During sunrise he would tak...