But late learners can still become proficient, if not seamlessly fluent, say the researchers.
研究人员表示,如果不是十分流畅的话,后期学习者仍然可以精通该语言。
It is unclear what causes the drop in the optimal learning rate seen at about age 18. The researchers suggest it could be because the brain becomes less changeable or adaptable in adulthood.
目前还不清楚是什么导致最佳学习率在18岁左右下降。研究人员认为,这可能是因为大脑在成年期变得不易变化或适应性减弱。
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