1)for the sake of/for ones sake 为……起见，为了……
His family moved to the countryside for the sake of his sons health.
他一家为了他儿子的健康搬到乡下去。
He betrayed his friend for moneys sake.www.Examw.com
他为了钱而出卖自己的朋友。
2)for ones own safety 为了某人自身的安全
For your own safety please dont smoke inside the plane.
为了你自身的安全，请不要在飞机上抽烟。
Please fasten your seat belt for your own safety.
为了你们自己的安全，请系上安全带。
3)for future reference 为了以后参考，为了今后备查
Keep all the price lists on file for future reference.
把所有的价格表存档，以便今后备查。
You can take this booklet home for future reference.
你可以把小册子带回家，留着以后参考。
