fore-

例句：

1. 1. The forerunners of the new technology were the pioneers who came before us.
   新技术的先驱者是那些在我们之前出现的先锋。
2. 2. The foreshadowing of the storm was ominous.
   暴风雨的预兆令人不安。
3. 3. The foreground is where we see the most action.
   前景是我们能看到最多动作的地方。