人们从动物的行为身上学到很多事情（men have learned much from the behavior of animas） 已经不是新鲜事儿了(is hardly new) 已经是一个完成的句子 直接加上That用其引出
如果换一个句子 what man can learn from the behavior of annimals is still discussed by the scientists.这样的话没有what句子就不完整了
__ men have learned much from the behavior of animals is har
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