[文法] 為何不能用in？

[apiod (神啊救救我吧)]

Smoking is banned on this campus.

我想請問用in不行嗎？

thx~

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推 deatherpot:因為ban on
→ apiod:thx~@@
→ dunchee:因為"campus"的usage 關係:
→ dunchee:http://www.ldoceonline.com/dictionary/campus
→ dunchee:http://www.learnersdictionary.com/search/campus
→ dunchee:http://www.ldoceonline.com/dictionary/ban_2