不可数名词量的表示:物质名词,抽象名词有时也可数。 1)物质名词 a. 当物质名词转化为个体名词时。 比较: Cake is a kind of food. 蛋糕是一种食物。 (不可数) These cakes are sweet. 这些蛋糕很好吃

发表于:2018-12-18 / 阅读(52) / 评论(0) 分类 大学四六级阅读

虚实篇 NO.7: 夫兵形象水,水之形,避高而趋下,兵之形,避实而击虚。 水因地而制流,兵因敌而制胜。 故兵无常势,水无常形。 能因敌变化而取胜者,谓之神。 故五行无常胜,四时无常位

发表于:2018-12-29 / 阅读(52) / 评论(0) 分类 孙子兵法

massive a.巨大的;大量的;魁伟的 master n.主人;能手;男教师 vt.掌握,精通 mat n.席子,垫子 match n.火柴;比赛;对手 v.(和)相配 mate n.伙伴;配偶 v.使配对 material n.物质,材料;素材,资料,题

发表于:2018-12-30 / 阅读(80) / 评论(0) 分类 大学英语四级词汇拼读版

SYDNEY: All molecules are not created equal. Some have saved billions of lives, wreaked environmental havoc or made the world a more colorful place. Here's our selection of those that have changed the course of human history。 发自悉尼:分子并

发表于:2019-01-08 / 阅读(69) / 评论(0) 分类 实用英语

讨论地核物质成分,科学家根据地震波传导的快慢,确定了地核的成分与地表的成分不同。然后科学家发现火山爆发出来的物质有钻石,证明地球深层是一个高温高压的环境,因为钻石只能在

发表于:2019-01-08 / 阅读(60) / 评论(0) 分类 托福英语

Kelvin died in 1907. That year also saw the death of Dmitri Mendeleyev. Like Kelvin, his productive work was far behind him, but his declining years were notably less serene. As he aged, Mendeleyev became increasingly eccentriche refused to acknowled

发表于:2019-01-29 / 阅读(66) / 评论(0) 分类 万物简史

No one knew about his principle, because Avogadro himself was a retiring fellow, he worked alone, corresponded very little with fellow scientists, published few papers, and attended no meetings but also it was because there were no meetings to attend

发表于:2019-01-29 / 阅读(69) / 评论(0) 分类 万物简史

Fortunately more sober types were at work elsewhere. In 1808, a dour Quaker named John Dalton became the first person to intimate the nature of an atom (progress that will be discussed more completely a little further on), and in 1811 an Italian with

发表于:2019-01-29 / 阅读(66) / 评论(0) 分类 万物简史

In between these undertakings, he somehow found time to conduct a good deal of solid science. He became the worlds foremost authority on thermodynamics and the first to elucidate the principles of the convection offluids and the circulation of ocean

发表于:2019-01-29 / 阅读(70) / 评论(0) 分类 万物简史

In the early 1800s there arose in England a fashion for inhaling nitrous oxide, or laughing gas, after it was discovered that its use was attended by a highly pleasurable thrilling. For the next half century it would be the drug of choice for young p

发表于:2019-01-29 / 阅读(50) / 评论(0) 分类 万物简史

In 1793, the Reign of Terror, already intense, ratcheted up to a higher gear. In October Marie Antoinette was sent to the guillotine. The following month, as Lavoisier and his wife were making tardy plans to slip away to Scotland, Lavoisier was arres

发表于:2019-01-29 / 阅读(220) / 评论(0) 分类 万物简史

The structure of atoms and the significance of protons will come in a following chapter, so for the moment all that is necessary is to appreciate the organizing principle: hydrogen has just one proton, and so it has an atomic number of one and comes

发表于:2019-01-29 / 阅读(70) / 评论(0) 分类 万物简史

For most of us, the periodic table is a thing of beauty in the abstract, but for chemists it established an immediate orderliness and clarity that can hardly be overstated. Without a doubt, the Periodic Table of the Chemical Elements is the most eleg

发表于:2019-01-29 / 阅读(73) / 评论(0) 分类 万物简史

Despite the occasional tidyings-up, chemistry by the second half of the nineteenth century was in something of a mess, which is why everybody was so pleased by the rise to prominence in 1869 of an odd and crazed-looking professor at the University of

发表于:2019-01-29 / 阅读(68) / 评论(0) 分类 万物简史

Someone of insight was needed to thrust chemistry into the modern age, and it was the French who provided him. His name was Antoine-Laurent Lavoisier. Born in 1743, Lavoisier was a member of the minor nobility (his father had purchased a title for th

发表于:2019-01-29 / 阅读(71) / 评论(0) 分类 万物简史

Scheele's one notable shortcoming was a curious insistence on tasting a little of everything he worked with, including such notoriously disagreeable substances as mercury, prussic acid (another of his discoveries), and hydrocyanic acida compound so f

发表于:2019-01-29 / 阅读(68) / 评论(0) 分类 万物简史

The commercial potential for the stuffwhich soon became known as phosphorus, from Greek and Latin roots meaning light bearingwas not lost on eager businesspeople, but the difficulties of manufacture made it too costly to exploit. An ounce of phosphor

发表于:2019-01-29 / 阅读(81) / 评论(0) 分类 万物简史

7 Elemental Matters 7 基本物质 Chemistry as an earnest and respectable science is often said to date from 1661, when Robert Boyle of Oxford published The Sceptical Chymistthe first work to distinguish between chemists and alchemistsbut it was a s

发表于:2019-01-29 / 阅读(55) / 评论(0) 分类 万物简史

英语四级英语单词记忆法 大学英语教学大纲规定四级考试对词汇的要求是记忆4200个单词以及由这些词构成的常用词组。根据研究分析大学英语四级考试历次真题,我们将四级词汇分为核心词汇

发表于:2019-02-09 / 阅读(93) / 评论(0) 分类 大学四六级阅读

LONDON, July 29 (Xinhua) -- By changing some particular brain chemicals lab mice would become hyperactive and sleep for just 65 percent of their normal time, according to a study released Wednesday by the Imperial College London. The chemicals, hista

发表于:2019-02-18 / 阅读(59) / 评论(0) 分类 英语新闻