in case of与for fear of的 区别请回答

for fear of:
a.唯恐
例句与用法:
1.The nurse walked on tiptoe for fear of waking the patient.
护士踮着脚走惟恐会吵醒病人.
2.We spoke in whispers for fear of waking the baby/for fear (that) we might wake the baby.
我们轻声谈话,以免吵醒婴儿.
3.He left a hour early for fear of missing the train.
他提早一小时离开,惟恐错过那次火车.
4."The teacher refused to have his daughter in his class,for fear of showing favour to her."
”教师不愿意把自己的女儿编入自己的班级,恐怕会对她有所偏袒.
in case of:
防备,假如,如果发生
例句与用法:
1.The doctor asked us to call him during the night except in case of necessity.
医生吩咐我们,除非必须,否则不要在夜里叫他.
2.We have an auxiliary generator in case of power cuts.
我们有一台万一断电时使用的备用发电机.
3.I have kept a reserve fund in case of accidents.
我已筹备了一笔准备基金以防不测.
4.Press this button in case of fire.
遇火灾时按下此钮.
5.In case of rain,they can't go.
万一下雨,他们就不能去了.
6.In case of flood,the dam can protect us.
在发洪水的时候,大堤可以保护我们.
7.In case of fire,ring the alarm bell.
如遇失火,请按警铃.
8.In case of emergency,break the glass and press the button.
遇到紧急情况时,击碎玻璃罩并摁下按钮.