Why don't we know the exact date when this head was made?

为什么我们不知道这个头像制作的确切日期呢？

youdao

youdao

But be that as it may, whatever the exact date, whether it's 15,000, 20,000 or 30,000 years ago, the Chauvet paintings are from the dawn of art.

但是，不管其确切的日期是在15000年、20000年还是30000年前，肖韦洞窟都属于艺术的开端。

youdao

Burma's military is yet to announce when the exact date for the elections although analysts expect the vote, the first in 20 years, to be around October or November this year.

VOA: standard.2010.07.27

And then you work out the exact date?

然后你确定准确时间？

普林斯顿公开课 - 国际座谈会课程节选

The exact date when Nguyen stepped aside from the company has until now been unclear.

FORBES: The Ugly Breakup Of A Color Friendship

Huntingdon County Court will also close, although the exact date has not been announced.

BBC: Ely Magistrates' Court closes doors for the last time

The RNLI said the exact date for the arrival of the Shannon at Montrose had not been determined.

BBC: New Montrose lifeboat after ?1.5m donation