TED演讲:原子究竟有多小?(1)

You probably already know everything is made up of little tiny things called atoms 你也许已经知道所有的东西都是由微小的原子组成。 You might even know that each atom is made up of even smaller particles called protons, neutrons

美联社新闻一分钟 AP 2016-4-26

This is AP news minute. 1. President Barack Obama is in Saudi Arabia ahead of the Gulf Cooperation Council summit on Thursday. Obama met with the king of Saudi Arabia after arriving amid strained tensions with the Saudi, over issues with Iran and Syr

TED演讲：气味背后的科学(3)

This smells of cut grass. Now, this is the skeleton of the molecule. 它闻起来就像割下来青草。这就是分子的骨架。 If you dress it up with atoms, hydrogen atoms -- that's what it looks like when you have it on your computer -- but a

VOA慢速英语2017-- 'The Murders in the Rue Morgue,' by Edgar Allen Poe, Part One

Paris! It was in Paris during the summer of 1840. There and then, I met a strange and interesting young man named August Dupin. Dupin was the last member of a well-known family, a family which had once been rich and famous. August Dupin, however, was

电信专业英英词典K

Key Telephone System (KTS) KTS is an arrangement of multi-line telephones and associated equipment that permits the station user to depress buttons (keys) to access different central office or PBX lin

VOA慢速英语 2007 0122a

This is the VOA Special English Development Report. Imagine a world without manufacturers. Or at least not as we now think of them. Instead, we as individuals control the technology to design and make most anything we want. That world exists now in t

【英语时差8,16】为什么特氟隆很滑

Why Teflon Is Slippery Teflon is the trademark name for PTFE, a type of plastic. If you own any non stick cookware, then you probably use PTFE on a daily basis. You might not realize, as you fry your morning eggs, that PTFE is one of the most slipper

万物简史 第143期:基本物质(15)

Because chemists for so long worked in isolation, conventions were slow to emerge. Until well into the second half of the century, the formula H2O2 might mean water to one chemist but hydrogen peroxide to another. C2H4 could signify ethylene or marsh

Electric motor made in single molecule

BEIJING, Sept. 6 (Xinhuanet) -- Scientists from Tufts University of the U.S. have created the world's smallest electrical motor in a single molecule. The finding was published in the journal Nature Nanotechnology on Monday. In the research, scientist

经济学人172:基础物理学 反物质现状

Science and technology 科学技术 Fundamental physics 基础物理学 Antimatter of fact 反物质现状 Researchers at CERN have held on to anti-atoms for a full quarter of an hour 欧洲核子研究中心的研究人员已经让反原子停留了十

TED演讲：宏观历史(5)

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

【英语时差8,16】神奇的温度-下

This extra jostling pushes the atoms farther apart, causing the whole substance to slightly increase in size. If the substance cools off, its atoms stop pushing against each other so vigorously. This makes the substance shrink again. This connection

【英语时差8,16】神奇的温度-上

They tell us how to dress in the morning and when to stop roasting a turkey. When we catch a cold, they tell us how sick we are. Thermometers are in everyday part of our lives, something we usually take for granted.Temperature affects human beings, m

学英语-激活语法(5)

Tips for Learning English 学英语的小技巧 Activating Your Grammar 激活语法 Activate your grammar by thinking about the general grammar area before you begin to study. 在开始学习前想一想该语法的基本知识来激活语法。 For

万物简史 第210期:威力巨大的原子(24)

To explain what kept atoms together, other forces were needed, and in the 1930s two were discovered: the strong nuclear force and weak nuclear force. The strong force binds atoms together; its what allows protons to bed down together in the nucleus.

英文热力歌曲:98° - Impossible Things

She was the only one, to dominate my high She was the only one, to illuminate the dark When its all said and done and the race has been run, run, run She was the only one To elevate her smile To devastate a room Take and inch and then a mile When all

【英语时差8,16】芦笋-下

But thats what comes out after we eat asparagus, which is not necessarily the same was what went in. Our digestive systems do some pretty complex chemistry, you know. Plus, the act of cooking the asparagus probably changes the chemistry around a bit,

万物简史 第349期:孤独的行星(14)

The figures have since been refined and made a little more generous, 自那以后，这两个数字被更精确地测算了一遍，放宽了一点， 5 percent nearer and 15 percent farther are thought to be more accurate assessments for our zone of

双语有声阅读：能量的来源

The Source of Energy A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun's very center. It is here that is to be found the source of the energy that the Sun constantly pours out into

万物简史 第197期:威力巨大的原子(11)

In 1910, Rutherford (assisted by his student Hans Geiger, who would later invent the radiation detector that bears his name) fired ionized helium atoms, or alpha particles, at a sheet of gold foil. To Rutherford's astonishment, some of the particles