1. America's thirtieth president was, in some ways, an unusual kind of person to lead the country. 在某些方面，美国的第三十任总统是个领导这个国家的与众不同的人。
2. The present crop of books and documentaries about Marilyn Monroe exploit the thirtieth anniversary of her death. 现在这批有关玛丽莲·梦露的书籍和记录片是借她去世三十周年纪念之机而发行的。
3. When March comes to the thirtieth day. 三月正当三十日。
4. A day is about one thirtieth of a month. 一天大约是一个月的三十分之一。
5. The thirtieth on the list is a young man. 名单上第三十个人是个年轻人。
