hang by a ˈhair/ˈthread(of a person's life人的生命)to be in great danger命悬一线；气若游丝；危在旦夕hang by a hair/thread千钧一发;岌岌可危;摇摇欲坠：The hurricane blew harder and harder and terrifying waves touched the sky，a small boat sailed on the vast sea，it really hung by a hair.飓风越刮越大，骇浪滔天，一叶小舟在茫茫大海中行驶，它真是岌岌可危。 |