I live on the second floor, and he lives on the first floor.

我住在二层，他住在一层。

youdao

First, they visited our classroom on the second floor at two fifteen.

首先他们在两点十五分参观我们的教室。

youdao

But it's kind of hard to get started studying when you have to relieve yourself in the third floor bathroom every five minutes (it's more trainquil than the ones on the first and second floor).

不过当你不得不在三层厕所（一、二层太挤）每五分钟放松下时，开始学习对你来说有些困难。

youdao

I live on the second floor, he lives on the first floor.

我住在二层，他住在一层。

普林斯顿公开课 - 人性课程节选

"If you don't like the view on the first floor, go look out the second floor, " she said.

WSJ: Dunes vs. property rights in storm-battered NJ

Local officials said 52 homes were damaged on the first floor and 32 others were flooded up to the second floor.

WSJ: Homeowners sue NY over $4.6M in flood damage

The first floor holds an office and some storage and utility rooms and three bedrooms are on the second floor.

WSJ: Building Outside the Box