on the floor/at the floor

由于作“楼层”解的 floor 看重在底面,所以常常跟 on 连用:

1. My office is on the second floor. (EED) 我的办公室在三楼。

2. On the floor above the theatre are deans' offices. 阶梯教室上面的那一层上有系主任办公室。

但是,有时候我们也会发现 floor 与 at 连用,这是因为把 floor 看作“点”的缘故:

1. At the third, and top, floor he left the lift and walked diagonally to the right. (Teffries,

Death）在第三层即顶层他下了电梯，斜着向右走去。

2. This elevator stops at every floor. (Mis) (这)电梯在每层都停。