研究人员说，儿童学习第二语言的最佳途径是通过社会交往和日常可以接触到这种语言。
The researchers say the best way for children to learn a second language is through social interactions and daily exposure to the language.
第二类是内在个体因素，涉及执行功能、语言、记忆、社会交往能力等。
The other is internal individual factors, that is executive function, language, memory, social interaction ability etc.
第二部分，作者分居住、社会交往、交通、家庭生活、闲暇生活、职业和劳动以及其它等七个方面分别对农村居民生活质量进行了评价和详细描述。
In the second part, the author evaluate the QOL of village habitants from seven aspects, such as living, social intercourse, traffic, family life, leisure life, Labour and career, others.
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