1-苯基-3-甲基-5-吡唑啉酮

SSS 2011-03-29

This is Scientific Americans 60-Second Science. Im Steve Mirsky. Got a minute? To keep your car purring, you have to change the oil. Such maintenance produces eight billion gallons of used motor oil annually. Some waste oil does get re-refined to pro

发表于:2018-12-24 / 阅读(73) / 评论(0)

Scientific American(三)月

国家地理-2008-06-12 Lost Pyramind Found 发现新的金字塔

Egyptian archaeologists have discovered the bottom part of an unknown pyramid in the Sakkara area about 18 miles south of Cairo. NationalGeographic explorer-in-residence Dr. Zahi Hawass, the Secretary General of the Egyptian Supreme Council for Anti

发表于:2018-12-30 / 阅读(64) / 评论(0)

国家地理2008年

AGRICULTURE REPORT - Restrictions on Methyl Bromide

AGRICULTURE REPORT - Restrictions on Methyl Bromide By Mario Ritter Broadcast: Tuesday, March 16, 2004 This is Steve Ember with the VOA Special English Agriculture Report. Graphic Image Some chemicals

发表于:2019-01-06 / 阅读(90) / 评论(0)

农业与发展

SSS 2008-04-17

This is Scientific American's 60-Second Science. I am Steve Mirsky.Got a minute? Talk about your vicious cycles. A new study finds that belly fat could be making you hungrier. Which would lead to more belly fat. The research was performed at the Univ

发表于:2019-01-08 / 阅读(74) / 评论(0)

Scientific American(四)月

英语听力：自然百科 Lost Pyramind Found 发现新的金字塔

Egyptian archaeologists have discovered the bottom part of an unknown pyramid in the Sakkara area about 18 miles south of Cairo. National Geographic explorer-in-residence Dr. Zahi Hawass, the Secretary General of the Egyptian Supreme Council for Anti

发表于:2019-01-22 / 阅读(68) / 评论(0)

自然百科2008年

2006年VOA标准英语-Russia's Gazprom Has Increasing Political Clout

By Anya Ardayeva Moscow 03 October 2006 watch Russia Gazprom report Illustration of Gazprom pipelines Russia's largest company, Gazprom, is now the leading supplier of natural gas to Europe. The state-run Russian conglomerate is also expanding into

发表于:2019-02-05 / 阅读(106) / 评论(0)

2006年VOA标准英语（十月）

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学英语单词

abernants

agoranomi

an(a)erobic fermentation

arteriovenous malformation of bowel