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1.The methylene radical is a small organic molecule that can form many different compounds.
甲基自由基是一种小有机分子，可以形成许多不同的化合物。
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2. The methylene radical plays a crucial role in the formation of natural gas.
甲基自由基在天然气的形成中起着至关重要的作用。
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3. The methylene radical is also used in the production of plastics and other synthetic materials.
甲基自由基还用于生产塑料和其他合成材料。