They were trying to remove harmful substances from the soil. 他們正設法去除土壤里的有害物質(zhì)。
It can effectively improve air quality by releasing the fresh air to purify the indoor air and adsorb harmful substance. 排放清新空氣以?xún)艋覂瓤諝?，吸附有害物質(zhì)，有效地提高空氣質(zhì)量。
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