Filter tips clean some harmful substance from the smoke.
滤嘴能消除香烟中一些有害得物质。
Determination on Harmful Substance in the Flue Gas Discharging from Household Coal Stoves and Gas Cooker
民用炉具排放有害物质的研究
Antitoxin is substance that acts against a poisonous substance and prevents it from having a harmful effect.
抗毒素是抵抗有毒物质并防止其产生有害作用的物质。
However, some harmful substance volatilized from fly ash in melting process, which caused second contamination.
然而，飞灰熔融过程中有有害物质挥发，造成二次污染。
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