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。
You must study harder (or) else you'll fail in the English examination.
你必须努力学习，不然的话，英语考试不会。
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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