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

We all know that in a falling elevator, you definitely do not escape the pull of gravity.

我们都知道在一个下坠的电梯里,你当然还是会受到重力的

耶鲁公开课 - 基础物理课程节选

When someone comes to us in the elevator in William James , ?" I says, "How are you doing?"

有人走向我们,在William，James大厅的电梯里，我说“你好吗“

哈佛公开课 - 幸福课课程节选