on campus还是in campus
正确表达法是“on campus (在校园)” ——固定词组，“in campus”是非正式、不规范的表达法。
She lives on campus.
她住在大学校园区内。
There are three dining halls on campus.
校园里有三个餐厅。
There is talk of raising the admission requirements to restrict the number of students on campus
有传闻称将通过提高录取条件来限制在校学生的数目。
Private automobiles are not allowed on campus.
大学校园不许私人汽车入内。
Students are prohibited from smoking on campus.
学生不准在校内吸烟。