[数] 对合的共轭元素

17 Evolution of Sleep

17.Evolution of sleep Sleep is very ancient. In the electroencephalographic sense we share it with all the primates and almost all the other mammals and birds: it may extend back as far as the reptiles. There is some evidence that the two types of sl

发表于:2019-01-02 / 阅读(173) / 评论(0)

英语范文背诵20篇

英语语法：186 Is “Ain't” a Word?

Grammar Girl here. Today's topic is ain't and a few other troublesome contractions. To quote the famous opening lines of the first-ever talking picture, The Jazz Singer: Wait a minute, wait a minute! You ain't heard nothin' yet! You may have been chi

发表于:2019-01-02 / 阅读(79) / 评论(0)

英语语法 Grammar Girl

英语语法：188 Lay Versus Lie

图片1 Today's topic is lay versus lie. Lay Versus Lie First, we'll do the easy part, which is the present tense... If you exclude the meaning to tell an untruth and just focus on the setting/reclining meaning of lay and lie, then the important dist

发表于:2019-01-02 / 阅读(65) / 评论(0)

英语语法 Grammar Girl

VOA慢速英语2011--The Evolution of Spacesuits

EXPLORATIONS - The Evolution of Spacesuits STEVE EMBER: Im Steve Ember. SHIRLEY GRIFFITH: And Im Shirley Griffith with the VOA Special English program EXPLORATIONS. Today we tell about the special clothes astronauts wear that protect them while they

发表于:2019-01-12 / 阅读(41) / 评论(0)

2011年VOA慢速英语(四)月

VOA标准英语2011--Book Chronicles Men's Evolution from Bre

Book Chronicles Men's Evolution from Bread-Winners to Bread-Bakers With many mothers working outside the home, more fathers - such as New Yorker editor and cartoonist John Donohue - are cooking for their families. Donohue wanted to chronicle men's ro

发表于:2019-01-13 / 阅读(58) / 评论(0)

VOA标准英语2011年(七月)

60秒科学:Pill May Change Attraction

Pill May Change Attraction In a study in the journal Trends in Ecology and Evolution, researchers note that the birth control pill may change a woman's choice in whom she finds attractive. Cynthia Graber reports Some people like to think theres somet

发表于:2019-01-30 / 阅读(94) / 评论(0)

60秒科学

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学英语单词

arcuate diaphragmatic ligament

auto-vulcanization

automatic system reconfiguration

Ban Nong Mek

Barashi