ph.
1. His life was hanging by a thread.
他的生命岌岌可危。
1. 千钧一发,岌岌可危：go off 爆炸 | hang by a thread 千钧一发,岌岌可危 | heap praise upon 对......大加称赞
2. 千钧一发：The handsomest flower is not the sweetest. 最好看的花未必香. | Hang by a thread 千钧一发 | hang-dog look 愁眉苦脸
3. 千钧一发,摇摇欲坠：give vent to 吐露,发泄 | hang by a thread 千钧一发,摇摇欲坠 | hold the fort 守住堡垒,坚守岗位,暂时代理应付紧急情况
4. 摇摇欲坠：hang by a hair 千钧一发 | hang by a thread 摇摇欲坠 | hang down 散落下来
verb
1. depend on a small thing or be at risk
e.g. His life now hangs by a thread
Synonym: hang by a hair