The family lived a precarious existence.

这家人过着朝不保夕的生活。

They lead the most precarious existence of all.

他们的生活中最不安定。

They eke out a precarious existence foraging in rubbish dumps.

他们靠在垃圾场捡垃圾维持着朝不保夕的生活。

The expression has a precarious existence in britain, at any rate in the spoken language, and was first heard by me in this contest about 1937 .

这个词组在英国，至少在口语中，一直不稳定，我第一次听到这种用法约在1937年。

As a consequence of this example in the family, the very mention of music as a profession carried with it a picture of a precarious existence with uncertain financial rewards.

所以在我们家，只要一提起音乐这个职业，大家就联想起收入不稳定的那种苦日子。

"There's this history of a precarious existence not just for our species but for our ancestors," says co-author Lynn Jorde, a human geneticist at the University of Utah in Salt Lake City.

“这段岌岌可危的生存史，不仅关系到我们这个物种，也关系到我们的祖先，”参与研究的Lynn Jorde说道，她是盐湖城犹他大学的人类遗传学家。

The existence of the human race in the world is as precarious as a mountain of eggs.

现在全世界人类的生命犹如累卵，如鸡蛋山一般。