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提出了语言习得最低言语输入量概念，并将言语输入量与语言习得关键期两个独立的概念结合在一起，设计了测量最低言语输入量的年令递增及输入量递减实验方法。
The concept of minimum verbal input of language acquisition is proposed, and the two independent concepts of verbal input and key acquisition of language acquisition are combined together. The experimental method of increasing the annual increment and decreasing the input amount of the minimum verbal input is designed.