求教英语中assure、ensure和insure的区别?

谢谢

assure通常人作主语 意为向某人保证 eg. I assure you they'll be safe with us.
ensure确保,担保 eg The book ensured his success.
insure 保险,投保 eg,He insured his house against fire.他为自己的房子保火险。
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