precurrent

例句：

1. 1. The prehistoric era is when humans first appeared on the earth.
   史前时代是人类首次出现在地球上的时候。
2. 2.He was appointed as the president of the company before his predecessor retired.
   在他前任退休之前，他被任命为公司的总裁。
3. 3.The precedence of this law over that one should be considered in all cases.
   在所有的案件中，都应该考虑这一法律对那一项的优先权。