 Plankton 浮游生物 |
Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They drift about lazily with the cu(12/02/2006 14:09:00,21) [查看全文] |
| Botany |
Botany, the study of plants, occupies a peculiar position in the history of human knowledge. For many thousands of years it was the one field of awareness about which humans had anything more than the vaguest of in(12/02/2006 14:09:00,22) [查看全文] |
| British Columbia |
British Columbia is the third largest Canadian provinces, both in area and population. It is nearly 1.5 times as large as Texas, and extends 800 miles(1,280km) north from the United States border. It includes Canad(12/02/2006 14:09:00,58) [查看全文] |
| 网络成瘾——和谐社会 |
As is illustrated in the picture, a student is excessively fond of computer game so that he can not see anything suddenly. Accordingly, the fact that students being on the rise spent their spare time playing computer games such as CS has aro(12/02/2006 14:09:00,93) [查看全文] |
| Telecommuting |
Telecommuting-- substituting the computer for the trip to the job ----has been hailed as a solution to all kinds of problems related to office work.
For workers it promises freedom f(12/02/2006 14:09:00,41) [查看全文] |
| Icebergs |
Icebergs are among nature's most spectacular creations, and yet most people have never seen one. A vague air of mystery envelops them. They come into being ----- somewhere ------in faraway, frigid waters, amid thun(12/02/2006 14:09:00,34) [查看全文] |
| Plate Tectonics and Sea-floor Spreading |
The theory of plate tectonics describes the motions of the lithosphere, the comparatively rigid outer layer of the Earth that includes all the crust and part of the underlying mantle. The lithosphere(n.[地]岩石圈)is di(12/02/2006 14:09:00,30) [查看全文] |
| Oil Refining |
An important new industry, oil refining, grew after the Civil war. Crude oil, or petroleum - a dark, thick ooze from the earth - had been known for hundreds of years, but little use had ever been made of it. In the(12/02/2006 14:09:00,24) [查看全文] |
| Raising Oysters |
In the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting them. First, farmers selected the oyster bed, cleared the bottom of old shells and other debris, then scattered clea(12/02/2006 14:09:00,30) [查看全文] |
| 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 li(12/02/2006 14:09:00,40) [查看全文] |
| Obtaining Fresh water from icebergs |
The concept of obtaining fresh water from icebergs that are towed to populated areas and arid regions of the world was once treated as a joke more appropriate to cartoons than real life. But now it is being conside(12/02/2006 14:09:00,34) [查看全文] |
| Coal-fired power plants |
The invention of the incandescent light bulb by Thomas A. Edison in 1879 created a demand for a cheap, readily available fuel with which to generate large amounts of electric power. Coal seemed to fit the bill, and it fueled the earliest pow(12/02/2006 14:09:00,42) [查看全文] |
| 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 government units (states and statistics come from the same Latin root status)(12/02/2006 14:09:00,39) [查看全文] |
| American black bears |
American black bears appear in a variety of colors despite their name. In the eastern part of their range, most of these brown, red, or even yellow coats. To the north, the black bear is actually gray or white in c(12/02/2006 14:09:00,30) [查看全文] |
| Cohesion-tension Theory |
Atmospheric pressure can support a column of water up to 10 meters high. But plants can move water much higher; the sequoia tree can pump water to its very top more than 100 meters above the ground. Until the end of the nineteenth century, t(12/02/2006 14:09:00,30) [查看全文] |
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