英语亲们帮忙啦Since hard and fast facts about first language acquisition are in short supply, it's not surprising to find that there are numerous competing theories on how best to learn a second or third language. One thing is certain though,

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英语亲们帮忙啦Since hard and fast facts about first language acquisition are  in short supply, it's not surprising to find that there are numerous competing theories on how best to learn a second or third language. One thing is certain though,

英语亲们帮忙啦Since hard and fast facts about first language acquisition are in short supply, it's not surprising to find that there are numerous competing theories on how best to learn a second or third language. One thing is certain though,
英语亲们帮忙啦
Since hard and fast facts about first language acquisition are in short supply, it's not surprising to find that there are numerous competing theories on how best to learn a second or third language. One thing is certain though, it doesn't happen overnight.
主要是Since hard and fast facts about first language acquisition are in short supply 怎么理解?

英语亲们帮忙啦Since hard and fast facts about first language acquisition are in short supply, it's not surprising to find that there are numerous competing theories on how best to learn a second or third language. One thing is certain though,
由于缺乏对第一语言习得方面有力而紧密的事实研究,在怎样学习第二或者第三语言方面存在着许多富有竞争性的理论就不足为奇了.
但有件事是确凿无疑的,学习第二或者第三语言并不是一朝一夕的事情.
since是表示原因,后面hard and fast 修饰facts,是“有力的紧密的”这个意思,first language acquisition是第一语言习得,in shot supply是供应不足,就是说这方面的研究还不透彻

由于第一语言习得缺乏有力的事实依据,所以许多关于如何最好地学习第二或第三语言的理论层出不穷,这个现象是肯定的,也不足为奇,绝不是一夜之间出现的事物。

由于对如何学好第一语言的方法匮乏这个不争的事实,关于第二或第三语言的最佳学习方法有很多相去甚远的理论也就不足为奇。但有一点是可以肯定的,对第二或者第三语言的学习决不是一蹴而就的事情。

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