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例句：The legal age for drinking alcohol in the United States is twenty-one. Underage drinking is a crime but also a common part of college social life.
govern/campus and off
例句：The policies govern behavior on campus and off.
with a first violation/for a second strike/a third strike
例句：With a first violation, students pay seventy-five dollars and their parents are told. They must also take an alcohol education class. For a second "strike," they have to pay one hundred fifty dollars. A third strike means a suspension for at least one semester.
