肯尼亞鄉(xiāng)村可上網(wǎng) (1)
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美國天然氣勘探呈現(xiàn)新面貌(1)
礦物燃料是由動植物的遺體經(jīng)過數(shù)百萬年腐化而來的。Hints:methane "proved reserves" the Appalachian Mountains MichiganMany people think the search for cleaner energy leads only to renewable resources...
填埋場上的葡萄園(1)
釀酒葡萄將種植在史泰登島植物園的每寸土地上,而史泰登島曾是美國大城市大多數(shù)生活廢物的填埋地。For years, most of the household waste collected in America's largest city went to a landfill on Staten...
美國學校的命名(1)
美國學校有一些是由人命名的,而現(xiàn)在這樣做的學校幾乎沒有了Public schools in New York, America's biggest city, commonly have numbers for names. But this is unusual. In the United States, the process...
美首位女性經(jīng)濟學大獎獲得者(2)
哈佛大學的蘇珊獲得今年的美國經(jīng)濟學最高獎項克拉克獎,并且是歷史上首位女性獲獎?wù)逴ne of the real-world situations that she has studied is government auctions. Auctions can be used to sell something ...