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。

The findings, in the journal Cognition, come from an online grammar test taken by nearly 670,000 people of different ages and nationalities. The grammar quiz was posted on Facebook to get enough people to take part.

发表在《认知》期刊的该研究，对近67万名不同年龄和国籍的人进行了在线语法测试。该语法测验在脸书上发布，以便有足够的人参与。

Questions tested if participants could determine whether a sentence written in English, such as: "Yesterday John wanted to won the race," was grammatically correct.

参与者要确定一个以英语写成的句子，例如：“昨天约翰想赢得比赛”的语法是否正确。

Users were asked their age and how long they had been learning English, and in what setting -- had they moved to an English-speaking country, for example?

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