ad.

1. 在前；向前
   The hills ahead are not wooded.

   前面的山上沒有生長樹木。

2. 預先，事前
   You'd better plan ahead.

   你最好事先計畫一下。

3. 領先，佔先
   Two people were ahead of us, and travelling fast.

   有兩個人在我們前面，走得很快。

4. 多賺，贏得

adv.