这是他第三十一次尝试。

This is his thirty-first attempt.

今天是这个月的第三十一天。

Today is the thirty-first day of this month.

我们将在第三十一天举行聚会。

We will have a party on the thirty-first day.

他在比赛中获得了第三十一名。

He finished in thirty-first place in the race.

她的生日是这个月的第三十一天。

Her birthday is on the thirty-first of this month.

十月第三十一是万圣节。

October thirty-first is Halloween.

万圣节是庆祝10月第三十一届。

Halloween is always celebrated on October thirty-first.

他的生日是一月第三十一日。

His birthday is on the 31st of January.

他们将在第三十一日宣布结果。

They will announce the results on the 31st.

活动将在十二月第三十一日举行。

The event will be held on the 31st of December.