someone or something that gives you a lot of help when you are in a very difficult situation

Sarah had been something of a lifesaver these past few days. 在过去的几天里，莎拉一直在救人所急。

When you're stuck in traffic, a mobile phone's an absolute life-saver. 堵车时，手机绝对是救命稻草。

Steven described his new job as a life saver for him and his wife Fiona - who has recently given birth to twins. 史蒂文将他的新工作描述为他和妻子菲奥娜的救命稻草——菲奥娜最近生了一对双胞胎。

something that helps save lives

Some doctors believe the test is a lifesaver. 有些医生认为这个测试是救星。

Your quick response in an emergency could be a life-saver for your child. 你在紧急情况下快速反应可能是你孩子的保命符。

Early detection of breast cancer is a life saver. 早发现是乳腺癌的救星。