So in the spring of his thirtieth year, Issa set out traveling in the tradition of haiku poets.(于是，在三十歲那年的春天，芭蕉遵循俳諧詩人的傳統，出門旅行。)

Thirty-three thousand people think that Thursday is their thirtieth birthday.(三萬三千人認為星期四是他們的第三十個生日。)

A day is about one thirtieth of a month.(一天大約是一個月的三十分之一。)

One second of arc movement is one thirtieth of a millimetre.(一弧秒的移動是一毫米的三十分之一。)

John scored a goal in the thirtieth minute of the match.(約翰在比賽的第30分鐘踢進一球。)

On Friday evening, he was also celebrating his thirtieth birthday.(在周五的晚上，他還要度過他30歲的生日。)

Please hand in your paper before June thirtieth.(請在六月三十日前交論文。)

The thirtieth on the list is a young man.(名單上第三十個人是個年輕人。)

Al Thagher's Class of 1976 is approaching the thirtieth anniversary of its graduation; no reunion has been scheduled.(AlThagher學校1976屆的班級畢業即將30周年，卻沒有安排任何聚會。)

The present crop of books and documentaries about Marilyn Monroe exploit the thirtieth anniversary of her death.(現在這批有關瑪麗蓮·夢露的書籍和記錄片是借她去世三十周年紀念之機而發行的。)