重点讲解：
1. be discharged from 允许…离开(医院、军队)；
When he was discharged from the hospital, he had lost 20 pounds.
出院的时候，他的体重减轻了20磅。
2. break out （战争、战斗或疾病）爆发；
Armed conflict may break out at any moment.
武装冲突有一触即发之势。
3. escape from 逃离；逃脱；
The prisoners used the tunnel to escape from jail.
囚犯们利用这条地道越狱逃跑了。
4. get out of 摆脱；逃避；
We are certainly in a tight corner, but with perseverance we shall manage to get out of it.
我们肯定已处于困境，但只要坚持住，我们就定能摆脱困境。