单词:harmful substance
harmful substance的用法和样例:
例句
- They were trying to remove harmful substances from the soil.他们正设法去除土壤里的有害物质。
- It can effectively improve air quality by releasing the fresh air to purify the indoor air and adsorb harmful substance.排放清新空气以净化室内空气,吸附有害物质,有效地提高空气质量。
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