同位素通量

SSS 2008-09-30

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. The Earths crust is old. Billions of years old. So old that its nearly impossible to imagine. And now scientists have discovered what may be the oldest

发表于:2018-12-24 / 阅读(62) / 评论(0)

Scientific American(九)月

SSS 2009-01-16

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Theres definitely methane on Marsand there are seasonal variations of how much is being released into the thin Martian atmosphere. Which means that Mar

发表于:2019-01-08 / 阅读(53) / 评论(0)

Scientific American(一)月

美国科学60秒 SSS 2012-12-11

What does an 800-pound gorilla eat? If you said: anything it wants, youre not thinking like a scientist. A scientist would say, Let me analyze the isotopic composition of its excreta and Ill get back to you. Because a new study shows that the ratio o

发表于:2019-01-08 / 阅读(42) / 评论(0)

Scientific American(十二)月

Scientists Closer to Solving Plain of Jars Mystery

Scientists Closer to Solving Plain of Jars Mystery A new group of human remains has been uncovered on the Plain of Jars in Laos. They are believed to date back to the Iron Age, some 2,500 years ago. The Plain of Jars is in the central Lao province of

发表于:2019-01-12 / 阅读(41) / 评论(0)

2016年VOA慢速英语(三)月

学个词Learn a Word 第1268期 flux

今天我们要学的词是flux。 Flux, 是动荡的，不断变化的。 The leadership of Yemen is in flux after former president Saleh was forced to step down, 也门前总统萨利赫被迫下台后，国家领导层处于动荡之中。 Afghani

发表于:2019-02-03 / 阅读(61) / 评论(0)

英语单词荟萃

万物简史第420期:生命的起源(14)

Compston's machine allowed such rocks to be dated with unparalleled precision. 康普斯森的仪器能以无与伦比的精确度测定这些岩石的年代。 The prototype SHRIMP was built and machined in the Earth Science department's own worksho

发表于:2019-02-17 / 阅读(58) / 评论(0)

万物简史

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above sb

accidental light

adequate stimiulus

air carbon-arc cutting

buying on a yield basis

by a stretch of imagination