The date of birth and death of Qu Yuan is unknown.

屈原的生卒年月不详。

《新英汉大辞典》

That's to do with the balance of birth and death rates.

这是出生率与死亡率平衡的问题。

youdao

We have seen birth and death, and thought they were different.

我们已经看到过新生和死亡，并且认为这两者极为不同。

youdao

Also,local governments usually keep official copies of birth, marriage and death records.

VOA: special.2010.06.28

"First Sight" begins with a soft keyboard riff just before Elliot sings a tale of the birth and death of love.

NPR: These United States: 'First Sight'

The inscription has her name, her date of birth and death and lists her awards - George Medal, OBE and Croix de Guerre.

BBC: Polish spy Krystyna Skarbek remembered

The Birth and Death Registration Office in Orange County, California, told CNN it had no record of Kekua, nor does the county coroner.

CNN: January 18, 2013 -- Updated 1628 GMT (0028 HKT)