这些尘埃直接将太阳光反射回太空，间接帮助了云的形成。
It does this directly, by reflecting sunlight back into space, and indirectly, by helping clouds to form.
检查瞳孔对光反射要通过对每个瞳孔轮流照射光线。检查直接对光反射和间接对光反射。
Test the pupillary reaction to light by shining a light on each pupil in turn. Observe for the direct reaction and the consentual reaction.
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