高中英语天象描写天空-Sky作文素材

2023-01-13 07:03:12 文档大全网 [ 字体：小中大 ] [ 阅读： ]

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天象,高中英语,描写,素材,作文

天象描写:天空-Sky

Sky

When you look at the sky on a clear day, it seems as if the earth is covered by a blue dome①. The sky is blue because of what happens to sunlight as it enters the earth's atmosphere. Sunlight is made up of light rays of all lengths. The longer rays make up red light and the shorter rays make up blue light. As sunlight enters the earth's atmosphere, it strikes the tiny molecules ② of air and is scattered③. The scattered light is made up mostly of violet④, blue, a little green, and a little yellow and red. The combination of these colors is sky blue.

Sometimes at sunset the sky looks red. The sunlight is coming toward you from a lower angle in the sky. The lower the sun, the longer is the path that the light rays must travel through the air. The shorter blue rays are scattered immediately when striking the molecules of air. The sunlight that you see lacks the blue and violet rays that the air has scattered. As the sun gets lower in the sky, the light rays must pass through more air,and so the longer orange and red rays also become scattered. At sunset, the shorter blue rays never get through the atmosphere, so you do not see them.

If you stand at a place where the surface of the earth is flat, the sky seems to meet the earth in any direction you look. The point at which the sky and the earth seem to“meet”is called the horizon. The horizon is at the same distance from you, no matter in what direction you look. If you walk toward the horizon, you do not get closer to it. No matter where you are, the surface of the earth curves ⑤ downward and away from you. The distance at which you can no longer see the earth's surface----because it has curved down too far----is the horizon. 【词语解释】

①dome [d+um] n. 圆盖；穹窿 ②molecule ['m&likju:l] n. 分子 ③scatter ['sk$t+] v. 使消散；使分散 ④violet ['vai+lit] n. 紫色；紫罗蓝色 ⑤curve [k+:v] v. 成曲形；弯曲【写法指要】

这是一篇科技知识小品式的天象描写文。作者以从上到下的空间顺序安排结构，先写苍穹的蔚蓝，用一个带有明喻“as if”的句型开头，写出天空像一个蓝色的大圆盖，然后以光波长短来分析天空呈蓝色的道理。接着作者写日落时天空呈红色的情景：这时的阳光在天空中以较低的角度射来，太阳越低，光线穿过空气的路程就越长；波长短的蓝色碰撞空气分子后立即散射，因此人们看不见，人们看到的是波长较长的橙色和红色。最后，作者写人们站在平地上极目四望的情景：人们看到的是天地相接处的地平线。这样，作者通过上、中、下三个层面的描写，给人们描绘出了天空呈蓝色、红色以及地平线形成的科学道理。