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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?!
声音1：山姆将他的壁虎放在生态箱，这是一个特别的盒子。生态箱能使大气保持正确的温度。萨姆将生态箱弄得像沙漠一样。里面有沙子、岩石和一些喜热植物。山姆的壁虎现在是这个家的一部分。他已经养了三年。一开始我对它们不太满意。但是，我承认我现在也开始喜欢它们了。这些小动物也是上帝创造的奇妙部分。你见过它们爬墙的方法吗？它们甚至可以挂在光滑的表面上。它们是怎么做到的？！
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.
声音1：一个科学家小组认为他们已经找到了答案。他们在美国加州大学开展研究工作。他们多年来一直在研究壁虎。研究小组发现壁虎的脚上有数百万个毛发状结构。这些结构被称为刚毛。刚毛会产生力量。科学家称之为范德华力。刚毛和细胞壁中的分子相互吸引，形成连接。这是因为分子中的电荷不平衡。因为小刚毛离墙很近。大量的刚毛会产生非常强大的力量。它们赋予壁虎奇妙的“粘着”力量。使壁虎能爬上墙壁。壁虎甚至可以倒挂在光亮的表面上。在将脚移开前，壁虎能稳稳地粘在这个表面上。移开脚之后，分子间的联系就断了。
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