light, travel, sun, moon, light bulb, straight line, bounce off, hit, surface, reflection, refraction, Natural light, Artificial light, transparent, translucent, opaque, shadow, block, object, shine, pass through, travel, sources of light, more dense, air, water.
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light
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Pyi2579
ประถมศึกษา
วิทย์
แสงและเสียง
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