二者都是“一樓”的意思，區別在于ground floor是英式英語的說法，first floor是美式英語的說法。而英式英語的“二樓”叫做：first floor，美式英語則是：second floor，以此類推。

floor的用法例句：

1.Ministers took the floor to denounce the decision to suspend constitutional rule.

幾位部長發言譴責暫停憲制的決定。

2.There was constant jeering and interruption from the floor.

議員席上不斷有人在嘲諷和打岔.

3.He was holding a cloth that dripped pink drops upon the floor.

他正拿著一塊布，布上粉紅色的水滴落在地板上。

4.She had been sitting with her knitting at her fourth-floor window.

她那時正坐在5樓的窗前織東西。

5.Bob slid from his chair and lay prone on the floor.

鮑勃從椅子上滑下來，趴在了地板上。

6.The sand on the floor scrunched under our feet.

地板上的沙子在我們腳下嘎吱作響。

7.The elevator creaked to a halt at the ground floor.

電梯嘎吱一聲停在了一層。

8.Books are often stacked in higgledy-piggledy piles on the floor.

書本經常亂七八糟地堆在地板上。

9.A bra and a pair of briefs lay on the floor.

地板上有一個胸罩和一條短內褲。

10.On the top floor we have sleeping quarters for women and children.

我們在頂樓有供女人和孩子睡覺的地方。