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Q:有一次,我看到一只壁虎,想抓住它,可它竟沿着墙壁飞快地爬到了天花板上,而且趴在那里不动了。为什么壁虎可以倒挂在天花板上不掉下来呢?
Q: Once I saw a gecko and wanted to seize it, but it climbed up to the ceiling swiftly along the wall and remained there lying still. Why geckos can not fall upside down on the ceiling it?