1、从某些特殊情况外,专有名词 、抽象名词和物质名词前不加冠词。例如: Wisdom is better than strength. 智慧胜于力量 Blood is thicker than water. 血浓郁水 2、在表示交通工具和科学名称的名词前不加

发表于:2018-12-01 / 阅读(58) / 评论(0) 分类 薄冰实用英语语法详解

Those planets are all going to be so hot, and you cant develop something as complex as life. Scientists have gone back to the drawing board, looking to find worlds capable of supporting life, small rocky planets like earth. We dont know that life has

发表于:2019-01-22 / 阅读(39) / 评论(0) 分类 自然百科2010年

JEFFREY BROWN:And now to part two of our investigative look at the safety of America's drinking water. Science correspondent Miles O'Brien reports on the toxic chemical made famous in the movie Erin Brockovich, its potentially harmful effect on human

发表于:2019-01-27 / 阅读(37) / 评论(0) 分类 PBS访谈环境系列

By Tom Rivers London 07 October 2009 Ada Yonath (file photo) Two Americans and one Israeli share this year's Nobel Prize in Chemistry for their work showing how the DNA code is translated into life itself. Americans Venkatraman Ramakrishnan and Thom

发表于:2019-02-03 / 阅读(48) / 评论(0) 分类 VOA标准英语2009年(十月)

Now, the going gets tougher. The next stage introduces entities that are significantly more fragile, significantly more vulnerable, 现在,(变化的条件)就更加苛刻了。下一个阶段是初次形成的个体,个体是明显更加弱小

发表于:2019-02-14 / 阅读(43) / 评论(0) 分类 TED演讲教育篇

台湾籍旅美老师今天交给我们的句子是: Well the water itself doesn't have any sugars or proteins like food so microbes aren't consuming it and rotting it. However, that's not to say the chemistry of the water hasn't changed. 水并不像

发表于:2019-03-05 / 阅读(136) / 评论(0) 分类 留美老师带你每日说英文