1.在戶外   adv.

Most of children played outdoors until it started to rain at six p.m..

大多數孩子在戶外玩耍，直到下午六點天下起雨來。

2.在戶外 adv.

In the countryside, farm workers spend most of their time outdoors.

在鄉間，農場工人大部分時間都在戶外。

3.戶外 n.

Her second daughter  is coming in from the outdoors.

她的二女兒從室外走進來。