The flash is aimed at the ceiling, wall or flash reflector, which disperses and softens the light, and bounces it back at the subject.
闪光时对准天花板，墙面或反光板，使得光线分散和柔化，并反射到被摄物上。
This mitigates glare and heat gain, while allowing full sunlight to bounce off the shelf and turn the ceiling into an indirect reflector.
这种措施减缓了光照强度和热辐射，同时使得天花上可以得到完全的光照，间接地反射到教室内。
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