His parents believe that he needs to spend more time on his homework because it is difficult to become a professional sports star.
他的父母认为，他需要花更多的时间在功课上，因为要成为一名职业体育明星是很难的。
It isn't hard to think of other explanations for why successful students might be in classrooms where more homework is assigned - or why they might spend more time on it than their peers do.
这不难想起其他关于为什么成功的学生也许会出现在留作业较多的教室里的解释，或者为什么他们会花比同学更多的时间在写作业上。
A new study in the Journal of Experimental Social Psychology examined how parents and teachers could encourage their kids and students to spend more time on their homework.
实验社会心理导报的一项新的研究对家长和教师如何能够鼓励孩子和学生花费更多的时间在作业上这一研究进行了考察。
She must spend more time on her homework.
她必须花更多时间在她的家庭作业上。
Spend more time on your work, Tom. You did your homework very (carelessly).
汤姆，在你的作业上多花费点儿时间。你的作业太不认真。
Spend more time on your work, Tom. You did your homework very (carelessly).
汤姆，在你的作业上多花费点儿时间。你的作业太不认真。
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