大写字母：SKY
例句
天上有四架飞机。
There are four planes in the sky.
2
我们只有六天的排练时间。
We only had six days of rehearsal.
3
我们的食物足够维持三天。
We've got enough food to last us (for) three days.
4
我还应有15天的休假。
I'm still due 15 day's leave.
5
我们在东京游览了三天。
We did Tokyo in three days.
6
投产3天，资金已经用完了。
Three days into production, the kitty had run dry.
