They study hard day and night.
他们白天黑夜的学习。
他们白天黑夜地学习。
They study hard, I am very glad.
用刻苦学习来回报我，我很欣慰！
Why didn't they study hard at English?
他们当时为什么不努力学英语呢？
他们学习努力。
They study hard. They do homework every day.
他们学习努力，他们每天做作业。
They study hard so that they will go into a good college.
他们努力学习以便他们能考入一个好的大学。
They study hard so that they can get a good result in exam.
他们努力的学习，以便考个好成绩。
They study hard and many of them have achieved remarkable success and won honour abroad.
他们在外努力学习，许多人取得了可喜的成就，赢得了荣誉。
They worked so hard to help us in study and life.
他们如此努力工作以帮助我们的学习和生活。
他们必须努力学习。
They do not study hard during the semester.
在本学期中他们不努力学习。
When it comes to study, hard problems never upset me, instead they arouse me.
当谈到学习，努力问题不会扰乱我，相反，他们唤醒我。
他们学习多努力啊！
They study English quite hard.
他们学习英语还比较用功。
It is good for the children to own the big dream, so that they will study hard and fight for their future.
孩子有伟大的梦想是好的，这样他们就会努力学习，为他们的将来奋斗。
They must study hard because it is very important for undergraduates.
他们必须努力学习，知识对大学生来说，很重要的。
They said they would study hard and live up to their parents' expectations.
他们说他们会努力学习，不辜负父母对他们的期望。
There are also some people who think that they are far superior to others in intelligence and therefore, do not need to study hard.
还有人认为自己远比他人聪明，因此无须努力工作，他们对于自己的成功太有把握。
They come here to have a rest after a week's hard work and study.
他们经过一周辛劳的工作与学习后来到这里休憩一下。
They encouraged me to study hard in order to be an educated sports man .
他们都鼓励我好好学习去成为一名运动员。
When it comes to study, hard problems never upset me, instead they arouse me.
说到学习，困难不会让我难过，反而会激励我。
I know, they Want me to study hard and not to waste time.
我高兴地跳了起来-。我明白他们想让我努力学习，不要浪费时间。
I know, they Want me to study hard and not to waste time.
我明白他们想让我努力学习，不要浪费时间。
I know, they Want me to study hard and not to waste time.
我明白他们想让我努力学习，不要浪费时间。
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