短语词组用作名词 (n.)形容词+～alphabetical sequence 字母顺序causal sequence 因果关系historical 〔natural〕 sequence 历史〔自然〕顺序介词+～in sequence 顺次,按照次序,次序井然～+介词sequence of events 事情发生的先后顺序短语 返回 sequences