antecedency
/æn'tɪsi:dənsɪ/[uncountable] the fact or condition of being antecedent; precedence in time or order先前,先行;优先
noun [抽象名词] 先行,在前;逆行
Now China ranks the antecedency in the world in the using efficiency and freight amount per kilometre. 目前中国铁路使用效率及平均每公里货运量,均位居世界前列。