The age at which the second language needs to be acquired to yield the protective effect is also unknown.
在什么年龄开始学第二门语言才能够产生推迟痴呆症的效果也是未知的。
Safar had told me that it was almost unknown for a Turcoman family to yield its daughter to a Russian man.
萨法（作者在 土库曼斯坦认识的一位朋友）曾告诉我，土库曼家庭中几乎很少有 人把女儿嫁给俄罗斯 人。
Safar had told me that it was almost unknown for a Turcoman family to yield its daughter to a Russian man.
萨法（作者在 土库曼斯坦认识的一位朋友）曾告诉我，土库曼家庭中几乎很少有 人把女儿嫁给俄罗斯 人。
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