thirtieth
英 [ˈθɜːtiəθ] 美 [ˈθɜːrtiəθ]
ord.第三十
n.第三十;三十分之一
复数：thirtieths
例句：
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与众不同的领导国家的人。
2.Thirtieth Olympiad is held with Yu in United Kingdom London in 2012.
第三十届奥运会将于2012年在英国伦敦举行。
3.Last year was the thirtieth year of reform and opening up. In the past thirty years, the contents of ideological and political education on college students had had a significant improvement.
去年是我国实行改革开放的第三十个年头，改革开放三十年来大学生思想政治教育内容有了很大的改进。
4.The ultrasound was used as the measurement of the left atrium function in the first day and the thirtieth day after recovering the cardiac rhythm of the patients with AF. During six months follow-up, we recorded ECG and clinical symptoms.
利用多谱勒超声于房颤复律后的第一天和第三十天测定左心房功能：随访6个月，记录心电图和临床症状。
