| 单词 | harmless chemical | 
| 释义 | harmless chemical Small contaminant molecules such as 1,4-dioxane are evaporated to the atmosphere where ultraviolet light breaks down the compound into harmless chemical.  Retrieved from Wikipedia CC BY-SA 3.0   Propylene and vegetable glycol, found in flavoured vapes, are harmless chemicals.  The Sun  E-cigarettes contain only nicotine and other relatively harmless chemicals.  Times, Sunday Times   | 
	
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