The United States has experienced a reduction of about 27 percent in the average annual exposure to fine particulate matter, with smaller declines in Europe.
美国人平均每年接触的细微颗粒物减少了约27%，欧洲的减少幅度较小。
The silicone resin is used in the form of a particulate with an average particle size of less than 700 mum.
所述有 机硅树脂以平均粒度小于700微米的颗粒形式使用。
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