[网络] 生物分子序列；生物序列

SSS 2009-12-30

Before you pay big money for caviar, check with two New York City high school students. Brenda Tan and Matt Cost worked with DNA barcoding experts at Rockefeller University and other researchers at the American Museum of Natural History to identify h

发表于:2018-12-02 / 阅读(56) / 评论(0)

Scientific American(十二)月

VOA慢速英语20060809b

HEALTH REPORT - Indonesia Passes Vietnam as Nation With Most Bird Flu DeathsBy Caty Weaver Broadcast: Wednesday, August 09, 2006 This is the VOA Special English Health Report. Indonesia Indonesia pass

发表于:2018-12-07 / 阅读(32) / 评论(0)

2006年慢速英语（八）月

SSS 2011-07-21

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. After water, tea is the world's most popular drink. Now three New York City high school students have discovered what maybe a bruing scandal because th

发表于:2018-12-24 / 阅读(77) / 评论(0)

Scientific American(七)月

数学英语 22 What Are Sequences in Math?

by Jason Marshall In the last few articles, weve talked about fractions and percentages, and soon enough well see that these ideas naturally lead us into the world of decimal numbers. But before we head down that path, lets take a quick detour to tal

发表于:2019-01-02 / 阅读(98) / 评论(0)

数学英语

数学英语 18 What Are Geometric Sequences?

by Jason Marshall In the last article, we began talking about mathematical sequencesin particular, a type of sequence known as an arithmetic sequence. Today, were going to turn our attention to another type of sequence called a geometric sequence. In

发表于:2019-01-02 / 阅读(105) / 评论(0)

数学英语

Biosolids

By Mario Ritter Broadcast: October 28, 2003 This is Steve Ember with the VOA Special English Agriculture Report. Farmers have long put animal waste on their fields. They may also use human waste. Mode

发表于:2019-01-02 / 阅读(73) / 评论(0)

VOA2003（下）-农业与经济

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