“物质的”用英语怎么说？

原油受到了自然产生的分解油类物质的微生物的侵蚀。The oil is attacked by naturally occurring microbes which break it down.防护手套可以减少皮肤对化学物质的吸收。Protective gloves reduce the absorption of chemicals through the skin.pH值测试可检测物质的酸碱度。A pH test measures t...