在日常生活中，无论是商业活动还是个人事务，授权书都是一种常见的法律文件。它用于证明某人有权代表他人执行特定任务或签署文件。对于需要使用英文的场合，一份标准的“授权书英文版范文”就显得尤为重要。

以下是一份简洁、正式且适用于多种场景的授权书英文版本，供参考：

Authorization Letter

To Whom It May Concern,

This is to certify that [Full Name of the Grantor], with ID number [ID Number], residing at [Address], hereby authorizes [Full Name of the Grantee], with ID number [ID Number], residing at [Address], to act on behalf of the grantor in all matters related to [specific purpose or activity, e.g., signing contracts, handling financial transactions, etc.].

This authorization is valid from [Start Date] to [End Date], unless otherwise revoked in writing.

The grantor confirms that this letter is issued voluntarily and without any coercion.

Sincerely,

[Full Name of the Grantor]

Signature: ___________________

Date: _______________________

Notes for Use:

- 请根据实际情况填写方括号中的内容。

- 如果涉及重要事项（如财务、法律等），建议由律师审核或公证。

- 在某些国家或地区，授权书可能需要公证或认证才能具有法律效力。