www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

您現在的位置: > Language Tips > Easy English > Odd Question  
 





  How do fireflies flicker?
[ 2006-06-23 09:59 ]

“一閃一閃亮晶晶,滿天都是小星星。”你小時候有沒有抓過螢火蟲玩?靜謐的夜里,螢火蟲的小燈籠就像天上的星星那樣閃耀。那時候我們都以為螢火蟲會發光一定是種魔法。那么,它真正的發光原理是什么呢?趕快讀讀下面的文章、尋找答案吧!

Memories of childhood include many things, the most spectacular of which may be hundreds of fireflies flickering over the fields covered by an evening mist.
Fireflies seem almost magical with their ability to produce light as they fly effortlessly above the grassy fields.

But it is not magic which creates the luminescence. The glow of the firefly is made by a chemical reaction within their bodies. A chemical called luciferin produces the glow when an enzyme called luciferase is mixed with it. Oxygen is required for this reaction and is supplied by a special opening in the abdomen of the fireflies' body. The lightning bug, as this little insect is popularly called, can control the intensity of the flash by varying the amount of oxygen mixed with the luciferase.

Most light forms we are familiar with produce heat. However the firefly has a very efficient means of producing light because no heat comes from the light it emits. This phenomenon of light produced without heat is called luminescence. If living organisms, such as lightning bugs, plankton in sea, or other creatures and plants, produce light, it is called bioluminescence. The light colors of fireflies can also vary by species and can be yellow, green, orange, or red. Some types of lightning bugs can produce two different colors of light.

Almost 2000 different species of fireflies have been discovered, most in the tropics. Biologists have studied them extensively, but we still don't know all there is to know about these fascinating insects.

luciferin: 熒光素

luciferase: 熒光素酶

enzyme: 酵

abdomen: 下腹部

luminescence:(無熱的)發光

bioluminescence: 生物發光

plankton: 浮游生物

(英語點津Annabel編輯)

 
 
 




主站蜘蛛池模板: 欧美不卡一区二区三区 | 久久精品视 | 特及毛片 | 日本一级全黄大片 | 国产成人一区二区三区在线视频 | 手机免费看毛片 | 国产高清av在线播放 | 欧美日本一道高清二区三区 | 国产99视频精品草莓免视看 | 作爱在线观看 | 成人看片黄a毛片 | 亚洲欧美日韩精品久久 | 国产高清在线观看 | 欧美日韩a级片 | 国产精品无圣光一区二区 | 欧美成人高清手机在线视频 | 日本一级毛片免费播放 | 扒开双腿猛进入爽爽在线观看 | 殴美毛片| 精品免费在线视频 | 欧美色老头oldvideo | 九九久久久久久久爱 | 日韩在线中文字幕 | 男人亚洲天堂 | 国产高中生粉嫩无套第一次 | 国产成人精品免费 | 国产在线精品二区韩国演艺界 | 最全精品自拍视频在线 | 中文字幕日韩一区二区 | 国产区在线免费观看 | 久久精品道一区二区三区 | 一级做a爰片久久毛片潮喷 一级做a爰片久久毛片美女 | 精品手机在线视频 | 国产香蕉久久 | 国产高清一级视频在线观看 | 久久免费看视频 | 无限观看社区在线视频 | 亚洲一区二区中文字幕 | 中文字幕在线一区二区三区 | 午夜成年| 看亚洲a级一级毛片 |