thirtieth

n.

第三十；三十分之一；

adj.

第三十个的；三十分之一的；

复数：thirtieths

1. Today is the thirtieth of December.
   今天是十二月三十日。
2. The thirtieth on the list is a young man.
   名单上第三十个人是个年轻人。
3. A day is about one thirtieth of a month.
   一天大约是一个月的三十分之一。
4. One second of arc movement is one thirtieth of a millimetre
   一弧秒的移动是一毫米的三十分之一。

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