outside前面用in还是on

in、at、on后面+地点名词才能和outside同等作用。outside已经表示出地点了，就是一个表示地点的词 。outside本身其中一个词性已是[介词],

outside

n.外部;外表;(建筑物等的)周围，外围;(靠近路中央的)外侧，外手

adj.外部的;在外面的;向外的;主建筑物以外的;向外面的;不属于本团体(或机构、国家等)的;不相关的

prep.在…外面;向…外面;离开;不在;不在…范围内;不属于

adv.在外面;向外面;在户外

例句：

Most of the dirt was on the outside of the tinted glass.

大部分灰尘在有色玻璃的外部。

There was room for 20 people at the outside.

最多只能容纳20个人。

It was dark outside and I couldn't see much.

外面很黑，我看不清。

She has the window open, however cold it is outside.

不管外面多冷她都开着窗户。