lifeline
noun [ C ] uk/?la?f.la?n/ us/?la?f.la?n/
命脉，生命线
something, especially a way of getting help, that you depend on to lead your life in a satisfactory way
For many old people living on their own the phone is their lifeline to the outside world. 对很多独居的老人而言，电话是他们与外界联系的生命线。
（尤指海上救援的）救生索
a rope that is thrown to someone who is in the water, especially the sea, and is in danger
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