If you go to college, you must work, not fool around.
要是你上大学，就得好好学习，不能虚度光阴。
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。
If you go to college, you must work hard, not fool around.
你要是上大学，就得好好学习，不能虚度光阴。
Indeed you must go, for it will be impossible for us to visit him, if you do not.
所以你必须去，因为你不去的话我们就更不可能去了。
If you go to college, you must work, not fool around.
她后悔虚度了大学的好时光。
To do your duty is not enough. You must go the extra mile.
只满足于分内事是不够的，你必须多做一点点。
You must go to see a doctor when you do not feel well.
当你感觉不舒服时，你要去看医生。
You must go to see a doctor when you do not feel well.
当你感觉不舒服时，你要去看医生。
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