但是长到十至十二个月的时候，他们就能识别家里所使用的两种语言了。
But between ten and twelve months, they could identify the different sounds of both languages.
这些儿童都是由研究人员从十所美国医院随机挑选的，并在接下来的十二年当中对这些家庭进行不定期的采访登记，评估他们的家庭情况以及孩子获得的教养情况。
Researchers checked in intermittently with the families over the next dozen years, assessing both their family situation and the child care provided.
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