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2020年，口罩核心材料熔喷布的价格坐上了过山车：从2万元/吨涨到65万元/吨，又跌到15万元/吨，再反弹回50万元/吨。

，更多细节参见搜狗输入法

who understood, from direct personal experience, that a law could be

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