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On a restricted site in northern Wisconsin, the hissing you hear is helping scientists see the future. Inside towering rings of pipes, aspen, birch, and sugar maples feed on measured diets of greenhouse gases. Our studies were looking at what forest
国家地理2007年
Grammar Girl here. Today I'm going to cover two short topics. So while I was home sick and listening to Undead and Unappreciated and Undead and Unpopular I had two happy little surprises when the main character asked the kind of questions that you li
英语语法 Grammar Girl
Rich cities around the world are largely responsible for greenhouse gas emissions, says a new study. The study measures emissions based on the use of goods and services, such as food, clothing and electronics, by people living inside cities. It inclu
2018年VOA慢速英语(三)月
This is the VOA Special English Development Report. Dye can bring a little color to life. Most clothing is colored with dyes. Modern, manufactured dyes can be costly. Natural dyes from plant and animal products have been used since ancient times. So
2010年VOA慢速英语(八)月
Scientists Develop New Ways to Track Greenhouse Gases With more than 18 million people living, working and driving in Los Angeles, the city often is covered in a hazy layer of smog. Stan Sander, senior research scientist at the U.S. space agency's Je
VOA标准英语2013年(七月)
[00:01]A：OK, people, on your toes. We're doing this one blind. [00:03]B：Gene, understand that we've never tried this before. [00:06]G：Look, it will ignite, will it not? [00:08]B：I just want you to know the engine's never been tried like this.
英美人天天都在说的4000句:跟着影视学最真实的口语