precursor /prɪˈkɜːsə/

• 1. 

  N-COUNT A precursor of something is a similar thing that happened or existed before it, often something that led to the existence or development of that thing. 前兆

  例：

  He said that the deal should not be seen as a precursor to a merger.

  他说这次交易不应该被看作是合并的前兆。