为了保护生态,人类不得不把很多濒临灭绝的动物关进动物园或者动物研究院。人类的目的并非想把这些动物保护在铁笼之内,而是帮助它们度过危险期,并选择合适的机会,让它们重返大自然。但是,当这些被圈养的动物,有朝一日重返大自然的时候,暴露出一个更严重的问题:它们野外生存的技能几乎已经没有了,尤其是那些从小就生活在人类身边的动物。 In order to protect the ecology, humans have to put a lot of animals on the verge of extinction into zoos or animal institutes. It is not the purpose of mankind to protect these animals in cages, but to help them survive dangerous periods and to choose the right opportunities for them to return to nature. However, when these captive animals return to nature one day, a more serious problem is exposed: their survival skills in the field have almost disappeared, especially those animals who lived as human beings from an early age.