新年前夜
The evening or last day of the year, December 31st.
一年中的最后一晚或最后一天，即12月31日。
The evening or day before Christmas Day.
选举前夜
The evening or day before an election.
选举前一天的晚上或白天。
仲夏夜
The evening or day before Midsummer's Day.
仲夏节前夕的晚上或白天。
在…前夕
In the period of time immediately before an event.
紧接在某个事件发生之前的一段时间。