小度窗外的英语可以翻译成 "outside the window"。这是一个普通的短语，没有特殊的来源。
下面是一些例句：
The birds were singing outside the window. (鸟儿在窗外唱歌。)
I could see the tree outside the window. (我可以看到窗外的树。)
She opened the window and looked outside. (她打开窗户看了看外面。)
希望这些例句能帮助你理解 "outside the window" 的意思。