最早的丝绸纸使用迹象是在一个贵族的坟墓中被发现的,据估计,这位贵族逝世于公元168年左右。
The earliest indication of silk paper being used was discovered in the tomb of a noble who is estimated to have died around 168 AD.
在过去十年左右的时间里,美国青少年对社交媒体的使用从偶尔的活动变成了日常活动。
Over a decade or so, American teens' social media use shifted from an occasional activity to a routine one.
世界希望将现代能源的使用范围扩大到十亿左右没有能源的人,同时也要减少使地球变暖的燃料。
World looks to expand modern energy access to the billion or so people without it, while also cutting back on fuels that warm the planet.
And the figure was that some 2,000 people die as a result of accidents each year using cell phones.
数据显示每年有2000人左右,因开车时使用手机,而死于车祸。
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