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日益严重的空气污染让人担心。不过,好消息是空气中含有一种名为羟基的化学物质,它能够净化空气。羟基,或称氢氧基。它是一个氢
The growing air pollution is worrying. However, the good news is that the air contains a chemical called hydroxyl that can purify the air. Hydroxyl, or hydroxyl. It is a hydrogen