短語詞組短語safe stable operation 安全穩(wěn)定運行safe in operation 安全操作;安全運行;翻譯safe railway operation [鐵路]鐵路安全運行safe repair operation 安全維修作業(yè)safe train operation 列車安全運行Safe comfortable operation 安全舒適運營safe economical operation 安全經(jīng)濟運行safe -operation 經(jīng)濟安全運行 返回 safe operation