是oncampus还是incampus

on campus

词典结果：

on campus

[英][?n ?k?mp?s][美][ɑn ?k?mp?s]

adv.在校内;

以上结果来自金山词霸

例句:

1.

Serena.what are you doing on campus so early?

serena你怎么这么早就来学校了?