Key points
1.lose one's life失去生命

2. protect sb. from 保护……免受……
Eg:戴太阳镜可以保护眼睛不受伤害。
Wearing sunglasses can protect our eyes fromthe sunshine.

3.ask sb. for help 向某人求助
Eg:当我们处于危险时，可以向警察求助。
We can ask the police for help when we are indanger.