第24用英语说是 "twenty-fourth"。这个词来自英文中的基数词 "twenty"（二十）和序数词 "fourth"（第四）。

例句：

The twenty-fourth chapter of this book is about the history of the universe. 第24章讲述了宇宙的历史。

The twenty-fourth of June is the day we celebrate our independence. 6月24日是我们庆祝独立日的日子。

The twenty-fourth person in line at the store was the lucky winner of the free gift. 在商店里排队的第24个人是免费礼物的幸运获得者。