outside是什么词性

词性是名词，介词，副词，形容词，例如：

1.This sense of privilege tends to be reinforced by the outside world.这种优越感往往会被外部世界强化。

2.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。

3.There was room for 20 people at the outside.最多只能容纳20个人。