First, take the case in the elevator is on the ground floor of some building and completely addressed.

首先我们来看看电梯,在一楼时候的情况

耶鲁公开课 - 基础物理课程节选

You can do that on email, you can do that in my office, which is downstairs on the first floor of this building, in LC-109.

发邮件，来办公室找我，我的办公室在这栋楼的1层，LC109室。

耶鲁公开课 - 现代诗歌课程节选

In one study they looked at a housing project in Manhattan and they asked people where their best friend was and 90% of them said, "My best friend is in the same building as me," and 50% of them says the same floor.

在一个针对一栋曼哈顿住宅的研究中,他们问住户他们最好的朋友住在哪,90%的人说，“我最好的朋友和我住同一栋楼”,50%说住在同一层楼。

耶鲁公开课 - 心理学导论课程节选