'If it's not transparent, or even translucent, but quite impenetrable to light, it's this'
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SCIENCE TERMS: If its not transparent, or even translucent, but quite impenetrable to light, its this
If it's not transparent, or even translucent, but quite impenetrable to light, it's this
If it's not transparent, or even translucent, but quite impenetrable to light, it's this
SCIENCE TERMS
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SCIENCE TERMS