The book is due back on the nineteenth (of the month).这本书最晚应于（本月）十九号归还。

one nineteenth of the total cost总成本的十九分之一

He was the country's nineteenth president.他是这个国家第十九任总统。

I was the nineteenth person to cross the finish line.我第十九个冲过终点线。

(humorous) the nineteenth hole [=the bar at a golf course where players drink after playing a round of 18 holes of golf]高尔夫俱乐部酒吧

She finished nineteenth in the race.她在这场比赛中得了第十九名。

the country's nineteenth largest state这个国家的第十九大州