科技英语手抄报

　　

　　1. Why the stars will flash flash it?

　　We see stars sparkle, this is>

　　10. Why did the baby will be born just been crying?

　　When you are making all sorts of new born babies cry, not because they feel unhappy, but they are the first port Dakoutaikou to breathe the air it!

　　When the baby to leave her mother at birth the body, they suck the air into the first port will be up to the throat, which will violently hit vocal cords, so that vocal cords vibration, and then issued a similar crying sound.

　　11. Why is the tail of lizards are constantly bouncing off behind that?

　　In order to protect themselves, many of Xi Tang also facilitate protective coloring deceive the public; while some lizards when attacked, the tail will be a result of intense muscle contraction caused by broken down. Based on the tail broken off there are still part of the nerve is alive, it will continue to bounce, thus dispersed the enemy's attention in order to escape. Do not think that the end of their lives so, in fact, just a few months, the tail will grow back and continue to live.

　　12. Why is the squirrel's tail particularly large?

　　Do not look relaxed rat tail! Squirrels jumping in the trees, while its tail is playing a very useful role. It can make squirrels in the trees be balanced when jumping to avoid falling injuries. In addition, this tail significantly better in the winter, the function of the protective, tightly around the squirrel's body, both convenient and practical.

　　13. Why does a person's thumb can not have one or three?

　　Most people have five fingers, while the length of the fingers are different. However, there is no one noticed that in addition to the thumb, other fingers have three, while only two thumbs alone do? The original, it is in line with the other four sessions means. If three, then the thumb would appear there is no power that it can not bring heavy objects; if only one, it can not easily with the other four fingers with the grasp things!

　　14. Why was not I do not feel itchy and scratching yourself?

　　As someone scratch their own, we will feel itchy, and kept laughing; However, when scratching his own time, not only do we not laugh, but also do not feel itchy. Based on our minds have been prepared, the brain will be issued a "no danger" message, nerves has also come to relax, so they will not laugh and feel itchy in!

　　15. Why is sea water are mostly blue, green?

　　Look to the sea, in many also found that water showed blue, green. However, when you picked up the water, you can only see it like the old days of water-like, transparent colorless. The original, the sea itself, with our daily come into contact with water, there are no major difference is transparent. We have seen the green, in fact, is the water absorption capacity of light arising out of the phenomenon. Only green water can be absorbed, and thus reflected out; as deeper water, the green light was absorbed, the sea looks became blue.

　　16. Why goose bumps?

　　Our skin long with fine hair, and each one has an erection under the hair pore muscle, when the subject nerve stimulation (for example: anger, fear, cold, etc.), the body temperature will decline, while the vertical hair muscle contraction will be thus making hair erected to form a goose bumps. In addition to the role with insulation, such a physiological body system would also make the animals more than it actually seems to deter the enemy.

　　17. Hippocampal which goes by the father's birth?

　　Almost all animals are also the next generation of female reproduction, but the hippocampus is different, it is out by a male birth. In the male hippocampus has a belly like a Kangaroo "parenting bag" bag of the hatchery, the female male Hippocampus hippocampus will routed to the hatchery egg sacs. After the male hippocampus on to take up the responsibility of breeding, after about three weeks, the small hippocampus would pop up from his father's body.

　　18. Why are the leaves changed color?

　　The leaves change color because of its inherent chemical substances - chlorophyll related. When autumn comes, the time during the day is shorter than that in the summer, but temperatures are relatively low, the leaves stop manufacturing chlorophyll, therefore, the remaining nutrients transported to the storage of trunks and roots. The green leaves in the absence of chlorophyll, at the same time, other chemical pigments and thus apparent, so we can see more colors such as yellow and brown leaves.

　　19. Why are there leaves?

　　Autumn is coming when the leaves on the evaporation of moisture more than the summer, but the roots are less absorbent than the summer. In order to reduce the moisture loss of trees, the stem cells began to form a separate layer, to be completely detached from the leaves of nutrients, the separation layer will separate the leaves and tree trunks, leaves to fall off.

　　20. Why did the whale will spray?

　　Whales are mammals one, but it does not nose shell nose, nose length in the head. It lives in water breathing with the lungs, can save a lot of one-off air, do not often go to the surface ventilation. But when it comes to the surface of the water ventilation, it will be used for nasal breathing, while breathing in vitro associated water spray is issued by the giant wave caused by the pressure.

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