Set an effective role

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I need a role setup for this task: {{task}}. Write it so that: (1) it is not a hollow 'you are a senior expert' but three concrete traits — what this role focuses on, what it refuses, and what standard it uses to judge quality; (2) it holds an actual position, since taste requires preference; (3) it specifies how to handle uncertainty — guess, say so, or ask for more; (4) it names the bias this role introduces, such as over-conservatism, and how to offset it; (5) keep the description under 100 words.

我要为这个任务设定角色：{{任务}}。请帮我写角色设定，要求：1) 不要写「你是一个资深专家」这种空泛人设，要写清这个角色的三个具体特征——关注什么、拒绝什么、用什么标准判断好坏；2) 给这个角色一个真实的立场（有偏好才有判断力）；3) 说明他会怎么处理不确定的情况（是猜、是说不知道、还是要求更多信息）；4) 指出这种角色设定可能带来的偏差（比如过于保守或过于激进），我该怎么平衡；5) 给一段 100 字以内的角色描述。