1、第一的英文：first，英 [fɜːst] 美 [fɜːrst]。

2、他讲的第一个笑话博得了当晚最开怀的笑声。His first joke got the biggest laugh of the night.

3、只有五匹马参加第一场比赛。There are only five horses running in the first race.

4、大多数运动我都喜欢，而网球是我的第一爱好。I like most sports but tennis is my first love.