求翻译：哺乳动物的寿命是其生长期的5～7倍。人的生长期是用最后一颗牙齿长出来的时间来计算，平均为20至 25岁。因此，人的理论寿命最短 100岁，最长 175岁。目前公认：人的理想寿命应该是120岁。是什么意思？

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The life expectancy of mammals is their hardiness 5 ~ 7 times. Who is the last teeth grow out long time to calculate, with an average of 20 to 25 years old. Therefore, the lowest life expectancy theory 100 years old, the longest 175 years old. At present the ideal life should be recognized: Who is 1

Mammal's life is its vegetal period 5~7 times.Human's vegetal period is the time which long comes out with the last tooth calculates, is equally 20 to 25 years old.Therefore, human's theory life is shortest 100 years old, longest 175 years old.At present recognizes: Human's ideal life should be 120

Mammalian life is 5~7 times its growth period. Human growth period is the last tooth long time to calculate the average is 20-25. Therefore, the theory of human's life short as 100 years old, up 175. Currently recognized: the ideal of human life should be 120 years old.

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