[矿物] 黝铜矿

科学美国人60秒 SSS 'Necrobiome' Reveals a Corpse's Time of Death

Tens of trillions of microbes call our living bodies home. But when we die? The first thing that happens is basically ecosystem collapsewhere you have a tremendous loss of diversity. Nathan Lents, a molecular biologist at John Jay College in New York

发表于:2018-12-02 / 阅读(80) / 评论(0)

2016年Scientific American(十二)月

英语语法：187 Is a Troop One Person or a Group?

Today, guest-writer Neal Whitman will help us understand why the word troops can refer to the number of individuals or groups. What Does Troops Mean? Memorial Day is next week, when we in the U.S. honor members of the military who have died in the li

发表于:2019-01-02 / 阅读(60) / 评论(0)

英语语法 Grammar Girl

Agroecology, Part 2

By Mario Ritter Broadcast: October 7, 2003 This is Doug Johnson with the VOA Special English Agriculture Report. Today we finish a two-part series. A listener in Brazil asked about 1)agroecology. This

发表于:2019-01-02 / 阅读(99) / 评论(0)

VOA2003（下）-农业与经济

Agroecology, Part 1

By Mario Ritter Broadcast: September 30, 2003 This is Steve Ember with the VOA Special English Agriculture Report. This week, we take a suggestion from a listener in Brazil. Agricultural specialist Lu

发表于:2019-01-04 / 阅读(80) / 评论(0)

VOA2003（下）-农业与经济

VOA标准英语2008年-US Group Targets Neglected Tropical Diseases

Earlier this year, President Bush said the United States would spend $350 million over five years to fight seven of the world's most common parasitic and bacterial diseases affecting hundreds of millions of people in tropical regions of the world. A

发表于:2019-02-02 / 阅读(51) / 评论(0)

VOA标准英语2008年（七月）

每日一词【722】robocall

今天我们要学的词是robocall。 Robocall指的是由计算机系统自动拨号，播放事先录制的电话留言的宣传电话。Robocall是产品促销和政治竞选的常用手段。A GOP group launched its robocall campaign against Sen

发表于:2019-02-04 / 阅读(94) / 评论(0)

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