高山植物群系

[ti:UNIT 2 Plant a Plant! Lesson 9: How Does a Plant Grow?] [0:00.532]UNIT 2 第二单元 [0:01.935]Lessons 9~16 第9~16课 [0:04.780]Plant a Plant! 培育植物! [0:06.829]You Will Learn 你将学到 [0:09.105]Functions 实际应用 [0:10.888]Ta

发表于:2018-12-13 / 阅读(153) / 评论(0) 分类 河北教育初中英语(初中起点)八年级下册

This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? We live in a nice neighborhood. Of the galaxy, that is. The sun is about halfway toward the outer edge of the Milky Way. But the sun may have migrated vast distances t

发表于:2018-12-24 / 阅读(69) / 评论(0) 分类 Scientific American(九)月

In the Rocky Mountains of Central Colorado, the forces of nature create a landscape of alpine lakes, high-altitude ponds teeming with life and mountain meadows bursting with wild flowers. It is amidst these beautiful wildflower fields that one scien

发表于:2018-12-30 / 阅读(36) / 评论(0) 分类 国家地理2008年

Study: Nature Creates Buffer Against Climate Change The study focused on semi-arid ecosystems which cover 40 percent of the planet and support 40 percent of the human population. Co-author David Eldridge, with the School of Biological, Earth and Envi

发表于:2019-01-13 / 阅读(53) / 评论(0) 分类 VOA标准英语2012年(一月)

In the Rocky Mountains of Central Colorado, the forces of nature create a landscape of alpine lakes, high-altitude ponds teeming with life and mountain meadows bursting with wild flowers. It is amidst these beautiful wildflower fields that one scient

发表于:2019-01-22 / 阅读(90) / 评论(0) 分类 自然百科2008年

TEHRAN, Oct. 18 (Xinhua) -- Iranian(伊朗) leaders on Monday urged for the quick formation of the Iraqi government, saying that will serve the interests of the Iraqi people and enable them to enjoy stability, security, unity and prosperity(繁荣

发表于:2019-02-06 / 阅读(74) / 评论(0) 分类 英语新闻