SDcamps•演辩营全国英语演讲与辩论赛
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 space as light and heat. This energy is liberated at the center of the Sun as billions upon billions of nuclei of hydrog...
However mean your life is,meet it and live it ;do not shun it and call it hard names.It is not so bad as you are.It looks poorest when you are richest.The fault-finder will find faults in paradise.Love your life,poor as it is.You may perhaps have some pleasant,thrilling,glorious hourss,even in a poor-house.The setting sun is reflected from the windows of the alms-house as br...
Bacteria Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters, bacterial size is measured in microns. One micron is a thousandth of a millimeter: a pinhead is about a millimeter across. Rod-shaped bacteria are usually from two to four microns long, while rounded ones are generally one micron in diameter. Thus if you enlarged a r...
A little Girl Sitting on a grassy grave, beneath one of the windows of the church, was a little girl.(1) With her head bent back(2) she was gazing up at the sky and singing, while one of her little hands was pointing to a tiny cloud that hovered like a golden feather above her head. The sun, which had suddenly become very bright, shining on her glossy hair, gave it a metalli...
Scientific Theories In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constan...
The History of Chemistry Chemistry did not emerge as a science until after the scientific revolution in the seventeenth century and then only rather slowly and laboriously. But chemical knowdedge is as old as history, being almost entirely concerned with the practical arts of living. Cooking is essentially a chemical process; so is the melting of metals and the administratio...
The Satiric Literature Perhaps the most striking quality of satiric literature is its freshness,its originality of perspective.Satire rarely offers original ideas.Instead, it presents the familiar in a new form. Satirists do not offer the world new philosophies.What they do is to look at familiar conditions from a perspective that makes these conditions seem foolish, harmful...
Schooling and Education It is commonly believed in the United States that school is where people go to get an education.Nevertheless, it has been said that today children interrupt their education to go to school. The distinction between schooling and education implied by this remark is important. Education is much more open-ended and all-inclusive than schooling. Education ...
The Language of Music A painter hangs his or her finished pictures on a wall, and everyone can see it. A composer writes a work, but no one can hear it until it is performed. Professional singers and players have great responsibilities, for the composer is utterly dependent on them. A student of music needs as long and as arduous a training to become a performer as a medical...
Topaz Topaz is a hard, transparent mineral. It is a compound of aluminum, silica, and fluorine. Gem topaz is valuable. Jewelers call this variety of the stone “precious topaz”. The best-known precious topaz gems range in color from rich yellow to light brown or pinkish red. Topaz is one of the hardest gem minerals. In the mineral table of hardness, it has a rati...
威廉.萨姆塞特.毛姆 / William Somerset Maugham That must be the story of innumerable couples, and the pattern of life it offers has a homely grace. It reminds you of a placid rivulet, meandering smoohtly through green pastures and shaded by pleasant trees, till at last it falls into the vasty sea; but the sea is so calm, so silent, so infifferent, that you are troubled sudde...
Choosing An Occupation Hodeslea, Eastbourne, November 5, 1892 Dear Sir, I am very sorry that the pressure of other occupations has prevented me from sending an earlier reply to your letter. In my opinion a man’s first duty is to find a way(1) of supporting himself, thereby relieving other people of(2) the necessity of supporting him. Moreover, the learning to do work o...
The Rainy Day The day is cold,and dark,and dreary; It rains,and the wind is never weary; The vine still clings to the moldering wall, But at every gust the dead leaves fall, And the day is dark and dreary. My life is cold and dark and dreary; It rains and the wind is never weary; My though still cling to the moldering past, But the hopes of youth fall thick in the blast, And...
蜂鸟 在一切生物中，要算蜂鸟体型最优美、颜色最鲜艳。经过工艺加工和各种宝石和金属是无法跟这个大自然的珍宝媲美的。大自然按照鸟类的大小把它列为最小号，真是”最小的绝妙珍品”。这咱小蜂鸟是大自然的杰作。大自然把其他鸟类只能分其中一部分的种种天赋全部慷慨地给了它。这个小宠儿具有轻盈、敏捷、灵活、优雅以及羽毛绚丽等一切妙外。那翠绿的、艳红的、嫩黄色的羽毛闪闪发光。蜂鸟从不让...
Oil and Water To understand the emulsifying process, we must first accept the scientific principle that oil and water do not naturally mix. Quite literally, they find each other’s presence repulsive. A good illustration of this aversion is homemade oil and vinegar salad dressing.When you shake or beat your salad dressing, you do more than disperse the oil throughout th...
Suburbanization If by “suburb” is meant an urban margin that grows more rapidly than its already developed interior, the process of suburbanization began during the emergence of the industrial city in the second quarter of the nineteenth century. Before that period the city was a small highly compact cluster in which people moved about on foot and goods were con...
Nitinol Nitinol is one of the most extraordinary metals to be discovered this century: A simple alloy of nickel and titanium, nitinol has some perplexing properties. A metal with a memory, it can be made to remember any shape into which it is fashioned, returning to that shape whenever it is heated. For example, a piece of nitinol wire bent to form a circle that is then heat...
Chimpanzee The most striking single fact about chimpanzees is the flexibility of their social life, the lack of any rigid form of organization. It represents about as far a departure from the baboon type of organization as one can find among the higher primates, and serves to emphasize the great variety of primate adaptations. Chimpanzees are more human than baboons, or rath...
Modern American Universities Before the 1850’s, the United States had a number of small colleges,most of them dating from colonial days. They were small, church connected institutions whose primary concern was to shape the moral character of their students. Throughout Europe, institutions of higher learning had developed, bearing the ancient nameof university. In Germa...
Statistics There were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedicated to keeping orderly records of governmental units (state and statistics come from the same Latin root status) and a gentlemanly gambling father who relied on mathematics to increase his skill at playing the odds in games of chance. ...