基本解释[能源科学技术]不饱和脂族烃词组短语短语aliphatic c unsaturated hydrocarbon 不饱和脂族烃unsaturated aliphatic hydrocarbon 不饱和脂肪烃aliphatic unsaturated hydrocarbon更多词组专业释义能源科学技术不饱和脂族烃