thirtieth
柯林斯词典
1. ORD The thirtieth item in a series is the one that you count as number thirty. 第30
...the thirtieth anniversary of my parents' wedding. …我父母的结婚30周年纪念日。
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thirtieth /ˈθɜːtɪɪθ/
剑桥词典
- 30th written as a word
第三十 返回 thirtieth