By singing with fervor, they're letting other birds know they survived the night—no guarantee in nature—and would make for an excellent mate.

通过热情地歌，让其他鸟儿知道自己已经安然度过黑夜——要知道自然界的动物过着朝不保夕的日子，不一定看见明天的太阳——并够成为出色的伴侣。

How long before they take his head?

朝不保夕？

As a consequence of this example in the family, the very mention of music as a career carried with it the idea of an uncertain existence. My parents insisted upon college instead of music school, and so to college I went.

家里有了这个，来只要一提到以音乐为生，我就想到朝不保夕的生活。父母坚持要我上大学而不是音乐学校，所以我就上了大学。

4 As a consequence of this, the very mention of music as a career carried with it the idea of an uncertain existence.

这件事的影响就是只要一提到以音乐为生，我就想到朝不保夕的生活。