单词：quaternary activity
单词：quaternary activity 相关文章
This is Scientific America's Sixty-Second-Science. I am Steve Mirsky. Got a minute? Some interesting electrical activity in the clouds of ash drifting around Europe as a result of that Icelandic volcano. Models predicted that electrical charge should
Scientific American(五)月
This is the VOA Special English Health Report. How active you are early in life may affect how able-minded you are late in life. That was the finding of a new study of cognitive impairment, or a loss in mental abilities. The study involved more than
2010年VOA慢速英语(七)月
Because the British were the most active in the early years, British names are predominant in the geological lexicon. Devonian is of course from the English county of Devon. Cambrian comes from the Roman name for Wales, while Ordovician and Silurian
万物简史
BEIJING, March 29 (Xinhua) -- Chinese President Xi Jinping on Wednesday stressed the importance of afforestation and urged people, especially the young, to understand and protect nature via tree planting activities. Chinese PresidentXi Jinpingtalks w
cctv9英语新闻2017年
A new study finds regular physical activity as a teenager may prevent cognitive impairment - a decline in mental abilities - decades later. Previous studies found that people who were physically active in later life were more likely to avoid mental d
VOA标准英语2010年(七)月