固定: fixed; regular来源: source; origin的: 4次方是 The fourth power of 2 i ...废气: exhaust gas; discharge gas; ...固定喷源的废气: emission from a stationary source固定来源: stationary source; stationarysource非固定来源；流动污染来源: mobile source排出的废气: combustion gas; exhaust fume第二来源的: second-source来源的性质: nature of the source更严格的废气测试: enhanced vehicle emission testing procedure排出的废气气味: the smell of the exhaust非石油来源的: non-petroleum origin（学校）学生来源的区域: catchment area供给来源的控制: control of source of supply陆地来源的污染: land-based sources of pollution; pollution from land-based source天然来源的放射性: naturally occurring radioactivity信息来源的可信度: source credibility冷起动时排出的废气: cold start emissions关税及贸易从协定来源：考试大: gatt; general agreement on tariffsfactor]血小板来源的生长因子: pdgf不同来源的能源混合使用: energy mix单核细胞来源的趋化因子: monocyte-derived chemotactic factor关于大型燃烧来源的指令: directive on large combustion sources基质细胞来源的细胞因子: stromal-derived cytokines
