The government announced the economic plan and subsequently implemented it.

subsequently 是由 subsequent（随后的）加上副词后缀 -ly 构成的副词。subsequent 来自拉丁语 subsequi，由 sub-（在...之后）和 sequi（跟随）组成，意思是"随后发生的"。 subsequently 在句中表示"之后、接着"的意思，强调动作发生的先后顺序。