precursor

先驱英释中释nsomething that happened or existed before something else and influenced its development

1 precursor chemicals,易制毒化学品

1 Error is often the precursor of what is correct..错误常常是正确的先导。

2 Viewed as a precursor to a wider open data movement, it could be as important as any we have seen in the web era..它被视为更宽泛的数据开放运动的先导，它将像我们在互联网时代看到的所有重要的事物一样重要。