Black's black what? 600字高中英语作文

　　What in the world the most dark? You may say, this problem some absurd, because black is black, shallow black is grey, what is the most black? In fact you are wrong! Because in the eyes of scientists, and there are black and dark. Such as black carbon, or be artificial black paint coat, the black can absorb visible light, but it can't absorb infrared and ultraviolet ray, so use infrared telescopes can see them. But there is a kind of material, infrared telescopes can't see it, because it absorbs the infrared rays, ultra-violet rays all, didn't reflect any frequencies of light, and because of that, this kind of material in the human eye, even sensitive viewer, it seems, is black, and it is the black thing in the world at present.

　　Of course, this HeiCaiLiao is not natural, but American scientists developed a kind of special material. Experiments confirm that this material can absorb 99.5% uv, visible and infrared light. Although there is also a performance before a near perfect absorption of light material, but the material is only valid absorb ultraviolet and visible light band, compared with the new material 'nearly 100 times better. New materials while unique role, but its structure is not very mysterious, it is actually a kind of pure carbon hollow tubular body, the thickness is one over ten thousand of the diameter of a human hair. They themselves have adsorption, can be attached to the vertical surface of different material, like the carpet of hair can be attached to the vertical on the carpet. If them daub on the surface of silicon, titanium and stainless steel, so the material becomes the most black thing in the world.

Time is

　　We are in a real world, can see animals and birds, flowers, hear harps smell fragrant scent, but of how we perceive time? Perception psychology thinks that the so-called "time" refers to people on the perception of time, it related to content, emotion, motivation, attitude, are also associated with the physical properties of external stimuli and situations.

　　In life, whether you also have the same question: why as we age, we will feel time passes faster and faster? Why time will slow down when in fear? Why the good times always very short?

　　People in youth, often can feel life slowly. The children eagerly want to hurry and grow up, sometimes staring at the clock on the wall, counting the hours. However, elderly person always sighed: "the dead husband, thereby working round." The older, really feel the faster time?

　　In the early 1960 s, psychologists wallach and green studied a group of young people (average age 19 years old) and elderly (average age 71) USES metaphor to describe the situation of the time. Results show that the young people tend to use metaphor to describe the static time, such as "time like peace, the stillness of the sea". Older people tend to use "time is a high-speed train" dynamic metaphor to describe this kind of time.

　　So let's cherish the time together.