救援队向落水者抛出了救生索。

The rescue team threw a ___lifeline to the person in the water.

对于偏远村庄来说，这条河流是他们的生命线。

For the remote village, this river is their ___lifeline.

这个24小时心理咨询热线是许多人的生命线。

The 24-hour counseling hotline is a crucial ___lifeline for many people.