事实上有研究表面，学生的学习成绩与平均睡眠时间长短正相关。
In fact, research shows there is a correlation between student grades and average amount of sleep.
另外一个是学习汉语的时间长短对他们理解汉语动宾结构的情况有没有影响，有多大的影响。
In addition, We also hope to see that if the time length has any effect on their understanding the Chinese VO structure, or how much effect it will have.
另外，权利与义务、 学习目标语言的时间长短、社会变革和文化交流等因素也影响着礼貌语言的选择和使用。
Other factors that influence the choice of language are rights and obligations, years of studying the target language, social change and cultural exchange.
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