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March 16th 1995-08-p5
Listen to partof a lecture given in a marine biology class. To us, the environment in which fish dwell(居住) often seems cold, dark and mysterious.
But there are adventages to livein water. And they'veplayed an important role in making fish what they are. One is that water isn't subjectto sudden temporature changes. Therefore it makes an excellent habitant for a cold-bloodanimal. Another advantage is the water'sability to easily support body weight. Protoplasm(细胞质)
has approximately the samedensity as water. So a fish in water is almostweightless. This weightlessness in term meanstwo things: 1) A fish can get along with a light weight and a simple bone structure. And 2) Limitations to afish's size are practically(实际上) removed. Yet there is one basic difficultyto live in water: the fact that (it) is incompressible. For a fish to move through water, it must actuallyshove it aside. Most can do this by wiggling back and forth in snakelike motion. The fish pushes water aside by the forward motion ofits head and with a curve of its body at its flexible tail. Next, the water flowes back along the fish's narrowingsize, closing in at thetail, and helping the fish propel itselfforward.
March16th 1995-12-p5
Listen to a lecturegiven in a dance history class. So, why did what isnow called "modern dance", begin in the United States? To begin to answerthis question, I'll need to back track a little bit and talk about classicballet. By the late 1800, ballet had lost a lot of its popularity. Most of the balletdancers who performed in United States were brought over from Europe. They performed usingthe rigid techniques that had been passed down through the
centuries. Audiences and dancersin United States were eager for their own contemporary dance form. And so around 1900,dancers created one. So how was this moderndance so different from classic ballet? Almost notably itwan't carefully choregraphed(choregraph v. 设计舞蹈动作). Instead, the dancedepended on mean improvisation and free personal expression of the dancers. Music and scenery(n. 风景)were of little importance to the modern dance. And lightness of movementwasn't important either. In fact, moderndancers make no attempt at all to concealthe effortinvolved in the dance step. But even ifimprovisation appealed to audiences, many dance criticists were lest? enthusiasticabout the performances. They(联系上下文才能与the分辨开)
questioned
the artistic integrityof dancers who were not professionally trained and the artisticvalue of works that
had no formalstructure. Loi Fore, after performing FireDance, was described as doing little more than turning roundand round like a eggbeater(n.打蛋器, [美俚]直升飞机). Yet the free personal expression of the pioneerdancers is the basis of the controlled freedom of modern dance today.
March16th 1996-01-p3
In 1871 the firstpassenger elevators were used in office buildingsand allowed architects to buildhigher than people could confortably work. Another innovationwas in building technique. In 1887 the steel skeleton wasintroduced and allowed for the construction of tall building that couldwithstand hign winds. We takefor granted some of the other inventionsthat enabled people to live and work in skyscrapers. For example, few people realizedthat the telephone was necessary for vertical communications, and that flush toilets and vacuum incinerator(焚化炉) waste disposal possible. Now (as)we've entered the age of super skyscraper(s?), some with more than 200 floors,we see the need for even more technological innovations. In the area of heating and cooling systemsfor example. For all their benefits, thesesuper tall buildings do cause problems though. For one thing, they place anenormous train(队列,链) on parking and traffic row in urban areas. But let's leave behind these technical concerns and move on to considersome of the design elements that have come to
characterize the age of the skyscraper. |