The picture is reproduced because the film or paper is sensitive to light.
转载的图片，因为电影或文件是敏感轻。
Photographic paper is highly sensitive to light.
感光纸对光十分敏感。
The paper substrate is coated on both sides with water-impermeable resin which carries an light sensitive emulsion on one side.
纸蕊的两面涂上防水树脂，再于其中一面涂上感光乳剂而成。
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