適合練習英語口語的文章
口語能力是英語能力的重要組成部分，當今社會，人們對它提出了越來越高的要求。今天本站小編爲大家帶來了適合練習英語口語的文章，歡迎閱讀!
Vision
視覺
Human vision like that of other primates has evolved in an arboreal environment. In the dense complex world of atropical forest, it is more important to see well than to develop an acute sense of smell. In the course of evolution members of the primate line have acquired large eyes while the snout has shrunk to give the eye an unimpededview.
人類的視覺，和其它靈長目動物的一樣，是在叢林環境中進化出來的。在稠密、複雜的熱帶叢林裏，好的視覺比靈敏的嗅覺更加重要。在進化過程中，靈長目動物的眼睛變大，同時鼻子變小以使視野不受阻礙。
Of mammals only humans and some primates enjoy color vision. The red flag is black to the bull. Horses live in amonochrome t visible to human eyes however occupies only a very narrow band in the whole electromagnetic spectrum. Ultraviolet rays are invisible to humans though ants and honeybees are sensitive to them. Humans have no direct perception of infrared rays unlike the rattlesnake which has receptors tuned into wavelengths longer than 0.7 micron. The world would look eerily different if human eyes were sensitive to infrared radiation. Then instead of the darkness of night, we would be able to move easily in a strange shadowless world where objects glowed with varying degrees of intensity.
在哺乳類動物中，只有人和一些靈長目動物能夠分辨顏色。紅旗在公牛看來是黑色的，馬則生活在一個單色的世界裏。然而，人眼可見的光在整個光譜中只佔一個非常狹窄的頻段。人是看不到紫外線的，儘管螞蟻和蜜蜂可以感覺到。與響尾蛇不同，人也不能直接感受到紅外線。響尾蛇的感覺器可以感受波長超過0.7微米的光線。如果人能感受到紅外線的話，這世界看上去將十分不同，而且恐怖。到那時，將與夜的黑暗相反，我們能輕易地在一個奇異的沒有陰影的世界裏走動。任何物體都強弱不等地閃着光。
But human eyes excel in other ways. They are in fact remarkably discerning in color gradation. The color sensitivity of normal human vision is rarely surpassed even by sophisticated technical devices.
然而，人眼在其它方面有優越之處。事實上，人眼對顏色梯度具有非凡的分辨能力。普通人類的視覺感受色彩的靈敏程度，甚至連精密的技術裝備都很難超越。
適合練習英語口語的文章篇二The source of Energy
能量的來源
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 librated at the center of the Sun as billions upon billions of nuclei ofhydrogen atoms collide with each other and fuse together to form nuclei of helium, and in doing so, release some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converted into helium in the Sun every second. This the Sun has been doing for several thousands of millions of year.
概說生命的物理和化學特性必須始於太陽--確切地說，是太陽的核心，而非地球。能量來自太陽的核心。在這裏，太陽不停地以光和熱的形式向空間傾瀉出能量。數十億計的氫原子核在太陽的核心碰撞並且聚變生成氦。在此過程中一部分原本儲存於原子核中的能量被釋放出來。太陽所產生的光和熱需要每秒將六億噸氫轉化爲氦。這樣的轉化在太陽中已經持續幾十億年了。
The nuclear energy is released at the Sun's center as high-energy gamma radiation, a form of electromagneticradiation like light and radio waves, only of very much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun to be reemitted at slightly longer wavelengths. This radiation , in its turn is absorbed and reemitted. As the energy filters through the layers of the solar interior, it passes through the X-ray part of thespectrum eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space without being absorbed further by solar atoms. A very small fraction of the Sun's light and heat isemitted in such directions that after passing unhindered through interplanetary space, it hits the Earth.
核能在太陽的核心被釋放爲高能的伽馬射線。這是一種電磁射線，就象光波和無線電波一樣，只是波長要短得多。這種伽瑪射線被太陽內的原子所吸收，然後重新釋放爲波長稍長一些的光波。這新的射線再次被吸收，而後釋放。在能量由太陽內部一層層滲透出來的過程中，它經過了光譜中X射線部分，最後變成了光。在此階段，能量到達我們所稱的太陽表層，並且離散到空間而不再被太陽原子所吸收。只有很小一部分太陽的光和熱由此方向釋放出來，並且未被阻擋，穿越星空，來到地球。
適合練習英語口語的文章篇三Obtaining Fresh water from icebergs
從冰山中獲取淡水
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 considered quite seriously by many nations, especially since scientists have warned that the human race will outgrow its fresh water supply faster than it runs out of food.
把冰山拖到世界上人口稠密的地區和乾旱地帶，再從中獲取淡水，這個想法曾一度被認爲是一個笑話，更適合於卡通畫，而非現實生活。然而現在，許多國家正相當認真地考慮這件事情，特別是在科學家們發出警告之後。科學家們認爲人類將在耗盡糧食之前首先耗盡淡水資源。
Glaciers are a possible source of fresh water that has been overlooked until recently. Three-quarters of the Earth's fresh water supply is still tied up in glacial ice, a reservoir of untapped fresh water so immense that it could sustain all the rivers of the world for 1,000 years. Floating on the oceans every year are 7,659 trillionmetric tons of ice encased in 10000 icebergs that break away from the polar ice caps, more than ninety percent of them from Antarctica. Huge glaciers that stretch over the shallow continental shelf give birth to icebergs throughout the year.
冰川是一個直到最近以前一直被忽視的可能的淡水源。全球四分之三的淡水還鎖在冰川的冰塊中。冰川就是一個蓄水池，其中未開發的淡水量是如此巨大，足夠支持全世界的江河1000年。每年有7,659萬億公噸冰漂流在海洋中。它們包含在10,000座從極地冰帽中斷裂出來的冰山中。這些冰山的90%以上來自南極。一年四季裏，覆蓋在淺層大陸架上的巨大冰川生成了衆多冰山。
Icebergs are not like sea ice, which is formed when the sea itself freezes, rather, they are formed entirely on land, breaking off when glaciers spread over the sea. As they drift away from the polar region, icebergs sometimes move mysteriously in a direction opposite to the wind, pulled by subsurface currents. Because they melt more slowly than smaller pieces of ice, icebergs have been known to drift as far north as 35 degrees south of the equator in the Atlantic Ocean. To corral them and steer them to parts of the world where they are needed would not be too difficulty arises in other technical matters, such as the prevention of rapid melting in warmer climates and the funneling of fresh water to shore in great volume. But even if the icebergs lost half of their volume in towing, the water they could provide would be far cheaper than that produced by desalinization, or removing salt from water.
冰山和海水的冰不同，後者是海水自身結冰形成的，而冰山則完全是在陸地上形成的。當冰川伸展到海水中時，冰山就斷裂下來。當漂離極地地區時，冰山有時會在底層洋流的推動下頗爲神祕地逆風移動。由於冰山比小塊的冰融化要慢，因此有的冰山在大西洋中向北飄到了赤道以南35°的地方。把冰山蓄攔起來並拖到世界上需要它們的地方將不會太困難。有困難的是其它的技術事宜。比如，如何防止冰山在較暖的氣候中迅速融化以及如何把大量的淡水收集到岸上去。但是，即便在拖的過程中冰山失去了一半體積，這樣做也遠比從海水中脫鹽取得淡水便宜。
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