形容詞 ahead:

1. having the leading position or higher score in a contest
   同義詞：in the lead, leading

副詞 ahead:

1. at or in the front
   同義詞：in front, before
2. toward the future; forward in time
   同義詞：forward
3. in a forward direction
   同義詞：onward, onwards, forward, forwards, forrader
4. ahead of time; in anticipation
   同義詞：in advance, beforehand
5. to a more advanced or advantageous position
6. to a different or a more advanced time (meaning advanced either toward the present or toward the future)
7. leading or ahead in a competition
   同義詞：out front, in the lead

1. By doing extra homework, he soon got ahead of his class-mates.
   他靠多做家庭作業(yè)，很快在班上名列前茅。
2. The man on the watch cried out: "Dangers ahead!"
   守望的人突然大喊:"前面有危險(xiǎn)!"
3. Joan ran ahead to film us as we crossed the bridge.
   我們過橋時(shí)，瓊跑到前面為我們拍照。
4. China is striding ahead in her economic construction.
   中國(guó)正在經(jīng)濟(jì)建設(shè)方面大步前進(jìn)。
5. He will be ahead of others in English.
   他在英語方面將超過別人。
6. He ran on ahead.
   他跑在前面。