（secondary reinforcer）又可分成三类，社会 增强物(social reinforcer)、活动增强物(activity reinforcer)、 代币增强物(symbolic reinforcer)。 正/负强化作用(物) 4.
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设置曝气装置，增加水体的含氧量，促进有益细菌及其他微生物的活动，增强其对污染物的吸附、氧化、分解和还原的作用。
Set device for exposure to increase the oxygen content in water and the activity of beneficial microorganisms, as well as their action of absorbing, oxidizing, decomposing and reducing pollutants.
随着人类航天活动的日益增强，空间目标数量日益增多，空间碎片是人类航天活动遗弃在空间的废弃物，是空间环境的主要污染物。
The quantities of space debris are increased day by day with the human space activities increasing. Space debris are castoff abandoned by human space activities, they are the dominating pollutant.
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