2012年考研欧博娱乐精选背诵:037_欧博娱乐
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2012年考研欧博娱乐精选背诵:037

文章分类:考研 宣布工夫:2017-7-14 10:19:17

 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 thunderous noise and splashing turbulence, which in most case no one hears or sees. They exist only a short time and then slowly waste away just as unnoticed.

  Objects of sheerest beauty they have been called. Appearing in an endless variety of shapes, they may be dazzlingly white, or they may be glassy blue, green or purple, tinted faintly or in darker hues. They are graceful, stately, inspiring -- in calm, sunlight seas.But they are also called frightening and dangerous, and that they are -- in the night, in the fog, and in storms. Even in clear weather one is wise to stay a safe distance away from them. Most of their bulk is hidden below the water, so their underwater parts may extend out far beyond the visible top.

  Also, they may roll over unexpectedly, churning the waters around them.Icebergs are parts of glaciers that break off, drift into the water, float about awhile, and finally melt. Icebergs afloat today are made of snowflakes that have fallen over long ages of time. They embody snows that drifted down hundreds, or many thousands, or in some cases maybe a million years ago. The snows fell in polar regions and on cold mountains, where they melted only a little or not at all, and so collected to great depths over the years and centuries.

  As each year's snow accumulation lay on the surface, evaporation and melting caused the snowflakes slowly to lose their feathery points and become tiny grains of ice. When new snow fell on top of the old, it too turned to icy grains. So blankets of snow and ice grains mounted layer upon layer and were of such great thickness that the weight of the upper layers

  compressed the lower ones. With time and pressure from above, the many small ice grains joined and changed to larger crystals, and eventually the deeper crystals merged into a solid mass of ice.

  全文翻译:冰山

  冰山是大天然最壮观的发明之一,但大少数人却从未看到过冰山,一种昏黄奥秘的氛围

  覆盖着它们。 冰山构成于长远的、冰冷的水体中,并且随同着雷声轰鸣般的喧闹和水花汹涌的风暴,但却无人耳闻目击。冰山仅存在短短的一段工夫就渐渐地悄无声气地消融失。冰 山具有最地道的美,人们如是说。

  冰山出现出千姿百态,能够白得耀眼,或许是闪灼着蓝 色、绿色或紫色的玻璃般的光辉,或浓或淡。它们在宁静的阳光照射的海水中显得优雅堂皇,令人浮想联翩。 但是人们亦把冰山称为恐惧的和风险的。 它们确实云云--在夜间,雾 天和风暴暴虐时。

  即使是在阴沉的气候里,与它们坚持一段平安间隔也是明智的。 冰山的 大局部体积稳藏于水下,因而其水下局部的舒展远远超越可见的顶部。 冰山也能够出其不意地翻腾,猛烈地搅动四周的水体。 冰山是冰川的一局部,从冰川断裂漂泊进水中,一段 工夫后消融。 明天的冰山由多年前下降的雪花构成。

  它们的体内是数百年,或数千年,有 时乃至是数百万年前的降雪。 这些雪花落在极地或冰冷的山上,仅有大批消融或基本不消融,如许颠末很多年大概多世纪后积聚了宏大的深度。 由于每年的雪花积聚在外表之上, 蒸发和消融使得雪花渐渐得到其羽状尖端而酿成巨大的冰粒。 当新的雪花下降到旧的外表 上,也酿成了冰粒。 因此雪花掩盖层和冰粒层层聚集起来直到云云之大的厚度致使较下层的分量紧缩较上层。在工夫和压力的作用下,很多小冰粒联合到一同酿成更大的晶体,最 终较底层的晶体兼并成巨大而巩固的冰块。

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