thirtieth是什么意思音标:英 ['θɜ:tɪəθ]美 [ˈθɚtɪɪθ]

num. 第三十, 三十分之一

n. position 30 in a countable series of things
s. coming next after the twenty-ninth in position

thirtieth的用法和例句：

1.To celebrate the thirtieth anniversary of the foundation of sister antonia's first village of goodness.

慶祝安東尼婭修女建成第一座行善村 30週年慶典