life-and-death

He is hovering between life and death.

处于生死之间。

He was balanced on a knife-edge between life and death.

处于生死关头。

They wouldn't ask for help unless it were a matter of life and death.

除非是生死攸关的事情, 们不会请求别人帮助。

Every time of education on the concept of life and death, should one time of edification, spiritualization and sublimation in mind.

每一次的生死观的教育，应该是一次心灵的启迪、心灵的净化、心灵的升华。