1. an oil that hardens in air due to oxidation and is often used as a paint or varnish base. 
   一种在空气中氧化后变硬的油，常用于涂料或清漆打底。
2. produces electricity by oxidation of fuel (hydrogen-oxygen or zinc-air); for use in electric cars. 
   通过氧化燃料产生电流；在电车中使用。
3. biological contact oxidation process 
   生物接触氧化法
4. oxidation and reduction process 
   氧化还原法
5. oxidation treatment of wastewater 
   废水氧化处理法

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