[数] 等价度量

CNN 2009-09-26

Hey,there,I'm Virginia Cha at the CNN center in Atlanta,with a look at what's happening NOW IN THE NEWS. Two alleged terror plots targeting 2 US cities,Federal Agents say the suspects in both plots were ready to pull the trigger.The alleged plots we

发表于:2018-12-20 / 阅读(45) / 评论(0)

CNN2009年(九)月

60秒科学:有机食品好处多

In side-by-side plots of strawberries grown organically or conventionally, the organic berries had more vitamin C and the soil was more biologically active. Molly Webster reports 通过对用有机方式培育的草莓和用传统方式培育的草莓进

发表于:2019-01-02 / 阅读(75) / 评论(0)

60秒科学

SSS 2010-09-08

This is Scientific Americans 60-Second Science, Im Molly Webster. Got a minute? Some consumers buy organically grown foods because they believe the products are healthier, tastier and better for the environment. But is this assessment true? To find o

发表于:2019-01-08 / 阅读(52) / 评论(0)

Scientific American(九)月

想要打击城市犯罪?多种树吧

Can a tree help prevent crime? It just might. Two new studies, led by US Forest Service researchers, took a closer look at urban green space in Philadelphia, Baltimore and Youngstown, Ohio. In each of these cities, adding green space to crime-ridden

发表于:2019-02-01 / 阅读(35) / 评论(0)

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VOA标准英语2011--US Guards Against Terrorist Attacks Befo

USGuardsAgainstTerroristAttacksBefore9-11Anniversary U.S. security officials are increasing efforts to thwart possible acts of terrorism in advance of the 10th anniversary of the September 11th, 2001, terror attacks. While the U.S. Department of Home

发表于:2019-02-12 / 阅读(84) / 评论(0)

VOA标准英语2011年(九月)

美国学生人类历史第89期:罗马帝国的兴起(2)

In the year 203 B.C. Scipio had crossed the African Sea and had carried the war into Africa. 公元前203年，西皮奥率军渡过阿非利加海，将战火烧到非洲。 Carthage had called Hannibal back. Badly supported by his mercenaries, Hann

发表于:2019-02-21 / 阅读(39) / 评论(0)

美国学生人类历史

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