急需一篇文章译文What makes a child speak a language has long been a

急需一篇文章译文
What makes a child speak a language has long been a puzzle to linguists.Roughly speaking,there are two schools of linguists,both of whom try to explain why a child picks up a language so easily.The fact that a child picks up a language with ease is surprising:at one year old,a child is able to say "bye-bye"; at two,he is able to use fifty words; by three he begins to master tenses.
The famous American linguist Noam Chomsky believes that human beings have a sort of built-in system for language use,and that the environment is only secondary.Children are not taught language as they are taught arithmetic.Other linguists,however ,hold the view that a child learns most of his language from the hints in the environment.By now ,theorists of both schools agree that there is a biological basis for language and language use.The problem is which is more important,the inner ability or the environment.This is certainly a field waiting to be explored.Researchers from both schools are busy finding evidence to support their own theory,but neither side is persuading the other.It seems that in order to find out why a child learns a language so easily,we have to rely on the joint efforts of both schools.Some linguists,like De Villiers,have recognized the value of cooperation,and urged linguists of both sides to work together.