用于限定题目范围或说明输出偏好，只对这一次生成生效。Use this to limit the scope or describe output preferences for this run only.
可以写题目范围、详略程度或表达风格。系统格式、LaTeX 和安全规则仍会优先。You can specify question scope, level of detail, or wording style. Format, LaTeX, and safety rules still take priority.
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