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

死关头。
死攸关
,重大
,冒险
;
,

;
命
;
,令人痛苦
;
;
痛苦
;
, 严重
;
,逐日
;He was balanced on a knife-edge between life and death.
他

死关头。
They wouldn't ask for help unless it were a matter of life and death.
除非是
死攸关
事情, 否则他们不会请求别人帮助。
He is hovering between life and death.
他

死之间。
Every time of education on the concept of life and death, should one time of edification, spiritualization and sublimation in mind.
每一次
死观
教育,应该是一次心灵
启迪、心灵
净化、心灵
升华。
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