If you go to college, you must study seriously and not fool around.
你若要考上大学，你就必须努力学习，不要浪费时间。
When I just went to school, mother often said to me: "you must study hard. " At that time, I nodded but I didn't really understand.
刚上学时，妈妈常跟我说：“你要好好读书。”那时的我，似懂非懂地点着头。
If you want high marks, you must study.
想得高分，就得用功啊。
If you want to be a scientist, you must study hard.
如果你想成为科学家，就必须努力学习。
In order to get higher marks, you must study even harder.
为了取得更高的分数，你必须更加努力地学习。
In order to improve your English, you must study hard.
为了提高你的英语，你必须努力学习。
If you must study, then study food, and how to get it.
你要是一定要学习，那就学学怎么觅食吧。
If you want to be a college student, you must study harder.
如果你想成为大学生，你必须更加努力学习。
If you are going to promote your products in a strange place, you must study people's consumption habit carefully so that unnecessary losses can be avoided.
当你打算在一个新的地区推广你的产品时，必须对那里的人们的消费习惯进行仔细的研究以避免不必要的损失。
您必须为准备考试而进行学习。
你一定要学好英语。
You must study hard by any means.
无论如何你必须努力学习。
你必须用功读书。
You must study hard; or else you will fail.
你一定要努力学习，不然就会失败。
You must study hard if you want to study well.
如果你想学习好，你就得努力学习。
It's really a skill to learn. You must study it.
制作咖啡真是一门学问，得花工夫学。
You must study hard, or else you'll fail in the exam.
你必须努力学习，不然你考试就不会及格。
You must study hard in order not to fail the exam again.
为了不在考试中再一次不及格，你必须努力学习。
You must study hard, because it is related to your future very much.
你要努力学习，这和你的未来有极大的关系。
You must study to be frank with the world: frankness is the child of honesty and courage.
你必须学会坦率面对世界：坦率是诚实和勇气之子。
You must study harder and harder, otherwise entering college may prove to be a castle in the air.
你学习必须努力，否则上大学可能是空中楼阁罢了。
You must study harder and harder, otherwise entering college may prove to be a castle in the air.
你学习必须努力，否则上大学可能是空中楼阁罢了。
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