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The pith of sunflowers is a kind of natural cellular material.
向日葵髓芯是一种天然的高分子泡沫材料。
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A cellular material is usually warmer than a solid one.
松软料子通常比硬板板的料子暖和些。
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This material is wood. A cellular plant material.
这种材料是木材。
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This material is wood. A cellular plant material.
这种材料是木材。
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