我想他们已经在楼前的大门上贴出通知了。
I think they have put the notice on the front gate of this building.
你让我在送任何东西上楼前都要电话通知你。
You asked that we call first before delivering anything upstairs?
在我下楼前，我就细心准备好我必须说什么。
Before I came downstairs I had prepared myself very carefully for what I must say.
在楼前徘徊的陌生人惊吓了我。
在楼前徘徊的陌生人惊吓了我。
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