词汇	elements of an orbit
释义	elements of an orbit 轨道根数
随便看	protective card of hard disk protective care unit protective case protective casing protective casing of hypodermic syringes protective casting protective/cathepsin A protective cell protective cells protective ceramic Protective characteristic of an arrester protective characteristics protective characteristics of arrester protective chelating agent protective choke protective choke coil protective circuit protective circuit breaker Protective Circuit for Submersible Motor protective circuit of television picture tubes protective class protective cloth protective clothes Protective Clothes protective content