单词	valve-seat face
释义	valve-seat face 气门面
随便看	synthetic stock synthetic stone synthetic stop synthetic stove re-formation synthetic strategy Synthetic stratum historgram synthetic strength synthetic study synthetic subsidence observation station synthetic substance synthetic substances synthetic substitute synthetic sulfated polysaccharides synthetic sulfur dye synthetic supermarkets synthetic-supervisor system synthetic support Synthetic Surface Sizing Agent AGP synthetic surface track Synthetic surfactant synthetic suture synthetic suture material synthetic sweetener synthetic switch test synthetic syllabus