被吸附意味着去吸附表面上的物质、液体或气体。
Adsorb means to attract and hold to the surface substances, liquids, or gasses.
当停留时间长时，微生物有足够的时间去吸附降解有机物，净化效率高。
When the residence time is long, the germs have enough time to degrade and absorb VOCs, so the efficiency is high.
实验表明4号活性炭仍具有一定的吸附功能，其他4种活性炭已经失去吸附过滤作用。
The results show that activated carbon No. 4 still retains some adsorption function. The other 4 kinds of activated carbon have lost their adsorption filtration functions.
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