适合练习英语口语的文章
口语能力是英语能力的重要组成部分，当今社会，人们对它提出了越来越高的要求。今天学习啦小编为大家带来了适合练习英语口语的文章，欢迎阅读!
适合练习英语口语的文章篇一
Vision
视觉
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.
人类的视觉，和其它学习啦在线学习网灵长目动物的一样，是在丛林环境中进化出来的。在稠密、复杂的热带丛林里，好的视觉比灵敏的嗅觉更加重要。在进化过程中，灵长目动物的眼睛变大，同时鼻子变小以使视野不受阻碍。
Of mammals only humans and some primates enjoy color vision. The red flag is black to the bull. Horses live in amonochrome world.Light 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.
在哺乳类动物中，只有人和一些灵长目动物能够分辨颜色。红旗在公牛看来是黑色的，马则生活在一个单色的世界里。然而，人眼可见的光在整个光谱中只占一个非常狭窄的频段。人是看不到紫外线的，尽管蚂蚁和蜜蜂可以感觉到。与响尾蛇不同，人也不能直接感受到红外线。响尾蛇的感觉器可以感受波长超过0.7微米的光线。如果人能感受到红外线的话，这世界看上去将十分不同，而且恐怖。到那时，将与夜的黑暗相反，我们能轻易地在一个奇异的没有阴影的世界里走动。任何物体都强弱不等地闪着光。
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.
学习啦在线学习网 然而，人眼在其它方面有优越之处。事实上，人眼对颜色梯度具有非凡的分辨能力。普通人类的视觉感受色彩的灵敏程度，甚至连精密的技术装备都很难超越。
适合练习英语口语的文章篇二
The source of Energy
能量的来源
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.
概说生命的物理和化学特性必须始于太阳--确切地说，是太阳的核心，而非地球。能量来自太阳的核心。在这里，太阳不停地以光和热的形式向空间倾泻出能量。数十亿计的氢原子核在太阳的核心碰撞并且聚变生成氦。在此过程中一部分原本储存于原子核中的能量被释放出来。太阳所产生的光和热需要每秒将六亿吨氢转化为氦。这样的转化在太阳中已经持续几十亿年了。
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.
核能在太阳的核心被释放为高能的伽马射线。这是一种电磁射线，就象光波和无线电波一样，只是波长要短得多。这种伽玛射线被太阳内的原子所吸收，然后重新释放为波长稍长一些的光波。这新的射线再次被吸收，而后释放。在能量由太阳内部一层层渗透出来的过程中，它经过了光谱中X射线部分，最后变成了光。在此阶段，能量到达我们所称的太阳表层，并且离散到空间而不再被太阳原子所吸收。只有很小一部分太阳的光和热由此方向释放出来，并且未被阻挡，穿越星空，来到地球。
适合练习英语口语的文章篇三
学习啦在线学习网 Obtaining Fresh water from icebergs
从冰山中获取淡水
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区和干旱地带，再从中获取淡水，这个想法曾一度被认为是一个笑话，更适合于卡通画，而非现实生活。然而现在，许多国家正相当认真地考虑这件事情，特别是在科学家们发出警告之后。科学家们认为人类将在耗尽粮食之前首先耗尽淡水资源。
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.
学习啦在线学习网 冰川是一个直到最近以前一直被忽视的可能的淡水源。全球四分之三的淡水还锁在冰川的冰块中。冰川就是一个蓄水池，其中未开发的淡水量是如此巨大，足够支持全世界的江河1000年。每年有7,659万亿公吨冰漂流在海洋中。它们包含在10,000座从极地冰帽中断裂出来的冰山中。这些冰山的90%以上来自南极。一年四季里，覆盖在浅层大陆架上的巨大冰川生成了众多冰山。
学习啦在线学习网 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 difficult.The 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，后者是海水自身结冰形成的，而冰山则完全是在陆地上形成的。当冰川伸展到海水中时，冰山就断裂下来。当漂离极地地区时，冰山有时会在底层洋流的推动下颇为神秘地逆风移动。由于冰山比小块的冰融化要慢，因此有的冰山在大西洋中向北飘到了赤道以南35°的地方。把冰山蓄拦起来并拖到世界上需要它们的地方将不会太困难。有困难的是其它的技术事宜。比如，如何防止冰山在较暖的气候中迅速融化以及如何把大量的淡水收集到岸上去。但是，即便在拖的过程中冰山失去了一半体积，这样做也远比从海水中脱盐取得淡水便宜。
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