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人体知多少？（１）如果把你体内的全部血管一根根首尾相接，它们会有乡长？６００００英里。（２）哪根手指的指甲长得最快？中指。中指一直保持着生长纪录──一般说，最长手指的指甲生长最快（平均速度大约１年１．５英寸）。而且非常奇怪，爱咬手指的人，指甲生长比一...
How much do you know? (1) If you connect all the blood vessels in your body end to end, will they have the mayor? 60,000 miles. (2) Which finger nails grow fastest? Middle finger. The middle finger has maintained a record of growth - in general, the fingers of the longest finger grow fastest (average speed is about 1.5 inches a year). And very strange, love to bite the finger, nails grow more than one ...