授权委托书用英语怎么说？

letter of attorney
letter of authorization

授权委托书
authorization
authorized letter of attorney
power of attorney

May I see your authorization for this?
我可以看看你做这件事的授权书吗?
The letter of attorney must list the items of trust and the limit of powers
授权委托书必须记明委托事项和权限。

power of attorney