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There is a critical cut-off age for learning a language fluently, according to research. 研究发现，流利地掌握一门语言有一个关键的年龄分界点。 If you want to have native-like knowledge of English grammar, for example, you should ideally start before age 10, say the researchers. 研究人员称，如果你想拥有比如说像讲母语者那样好的英语语法，那么最好在10岁前就开始学习。 People remain highly skilled learners until 17 or 18, when ability tails off. 17或18岁之前的人仍然是高技能的学习者，但之后该能力会下降。 | 
