the doer must remain unidentified
The doer is unknown 不知道实施方是谁 The doer must remain unidentified 实施方不能被点明 The receiver of the action is more important than the doer 动作的受众比实施方更重要 ..
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the doer must remain unidentified
行为人必须保持身份不明
以上为机器翻译结果，长、整句建议使用 人工翻译 。