評論
打印
Voice 1: Sam keeps his geckos in a vivarium — a special box. The vivarium keeps the atmosphere the correct temperature. Sam has made the vivarium look like a desert. It has sand, rocks and a few heat loving plants. Sam's geckos are now very much part of the family. He has had them for three years now. At first I was not very happy about them. But, I admit, I have also started to enjoy them. Even these small creatures are a wonderful part of God's creation. Have you seen the way they can run up walls? They can even hang on smooth surfaces. How do they do that?!
聲音1：山姆將他的壁虎放在生態(tài)箱，這是一個特別的盒子。生態(tài)箱能使大氣保持正確的溫度。薩姆將生態(tài)箱弄得像沙漠一樣。里面有沙子、巖石和一些喜熱植物。山姆的壁虎現(xiàn)在是這個家的一部分。他已經(jīng)養(yǎng)了三年。一開始我對它們不太滿意。但是，我承認我現(xiàn)在也開始喜歡它們了。這些小動物也是上帝創(chuàng)造的奇妙部分。你見過它們爬墻的方法嗎？它們甚至可以掛在光滑的表面上。它們是怎么做到的？！
Voice 1: Well a group of scientists believe they have the answer. They work at the University of California in the United States. They have studied geckos for many years. The team discovered that geckos have millions of hair-like structures on their feet. These structures are called setae. The setae create forces. The scientists call them Van Der Waals forces. The molecules in the setae and the wall pull towards each other, and form a link. This happens because of unbalanced electrical charges in the molecules. And it is because the small setae are very close to the wall. The large numbers of setae produce very strong forces. They give the geckos wonderful "sticking" power. The geckos can climb up walls. They can even hang upside down from a shiny surface. The creatures stay safely attached until they remove their feet from the surface. Then the link between the molecules breaks.
聲音1：一個科學家小組認為他們已經(jīng)找到了答案。他們在美國加州大學開展研究工作。他們多年來一直在研究壁虎。研究小組發(fā)現(xiàn)壁虎的腳上有數(shù)百萬個毛發(fā)狀結構。這些結構被稱為剛毛。剛毛會產(chǎn)生力量。科學家稱之為范德華力。剛毛和細胞壁中的分子相互吸引，形成連接。這是因為分子中的電荷不平衡。因為小剛毛離墻很近。大量的剛毛會產(chǎn)生非常強大的力量。它們賦予壁虎奇妙的“粘著”力量。使壁虎能爬上墻壁。壁虎甚至可以倒掛在光亮的表面上。在將腳移開前，壁虎能穩(wěn)穩(wěn)地粘在這個表面上。移開腳之后，分子間的聯(lián)系就斷了。
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