用户遇到曝光不准（雪景拍成灰色、逆光人像面部全黑）、问"测光表怎么用"、 或面对高反差场景不知如何曝光时调用。不适用于光圈快门创意选择 （应调用 exposure-dual-control）或胶片宽容度理论查询。 Invoke when the user faces incorrect exposure (gray snow, black faces in backlight), asks "how to use a light meter," or doesn't know how to expose high-contrast scenes. Not for aperture/shutte
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