This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. The Earths original atmosphere would have been unpleasantdeadly in factto any organisms that breathe oxygen. There wasnt any. Not until about 2.4 billi

发表于:2018-12-24 / 阅读(48) / 评论(0) 分类 Scientific American(四)月

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. In 1953 a student named Stanley Miller did an experiment showing that the simple chemicals present on the early Earth could give rise to the basic buildi

发表于:2019-01-08 / 阅读(52) / 评论(0) 分类 Scientific American(十)月

Let us return to original chaos! 让我们重归于元始的混沌! Let us imagine the primordial din, the original vortex! 让我们臆想那本初的喧嚣、元始的漩涡! Let us throw ourselves into the whirlwind which has preceded the crea

发表于:2019-02-01 / 阅读(97) / 评论(0) 分类 实用英语

WASHINGTON, Aug. 4 (Xinhua) -- Researchers have found a way to turn mouse embryonic stem cells into sperm and this finding opens up new avenues for infertility research and treatment, according to astudy published Thursday in the online edition of jo

发表于:2019-02-04 / 阅读(115) / 评论(0) 分类 英语新闻

GRE优秀作文:科学的作用。GRE频道小编为同学们整理了GRE优秀作文:科学的作用,供同学们参考使用,希望对同学们的gre 考试有所帮助,下面和小编一起来看看吧: 题目: The function of scienc

发表于:2019-02-09 / 阅读(28) / 评论(0) 分类 GRE作文

Astrophysics 天体物理 Dust to dust 尘归尘,土归土 A dramatic recent discovery in physics is looking rather dodgy 近期,物理学中的一项戏剧性发现看上出非常模糊 IN MARCH Chao-Lin Kuo, an astrophysicist at Stanford Univer

发表于:2019-02-16 / 阅读(49) / 评论(0) 分类 经济学人科技系列