Learner's definition of AHEAD
1
a : in or toward the front在前面；向前面 -
The road stretched ahead for many miles.这条路向前延伸了数英里。
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Someone was standing in the road (up) ahead.有个人正站在路前方。
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We knew the way ahead [=forward] was difficult, but we persevered.我们知道前面的路途很艰难，但是我们坚持不懈。
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“Full speed ahead!” shouted the captain.“全速前进！”船长大声喊道。
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He was looking straight ahead. [=directly forward]他当时径直向前望去。
b : to or toward the place where someone is going预先；较早 2
: in, into, or for the future为将来 -
We need to think/plan ahead.我们需要为将来打算。
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The past year has been successful and, looking ahead, we expect to do even better in the coming months.去年是成功的一年，展望未来，我们期望在今后几个月更上一层楼。
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We have some hard work ahead.我们今后还会有一些艰巨的工作。
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He expects to be very busy in the weeks ahead.未来几周他会很忙。
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We don't know what lies ahead.我们不知道前景如何。
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We'll pause now for a commercial. The weather report is just ahead. [=the weather report will be broadcast after the commercial]我们先暂停一下插播广告。随后是天气预报。
3
: in the lead in a race or competition（在比赛中）领先 -
They were trailing by 5 points earlier in the game, but now they're ahead [=winning] by 7.比赛开始不久他们落后5分，但是现在他们领先7分。
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They scored three runs to go ahead by two.他们跑垒得了三分，领先两分。
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a politician who is ahead in the polls在民意调查中处于领先的政治人物
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We're winning now, but we have to work hard to stay/keep ahead.我们胜利在望，但我们必须努力保持领先优势。
4
: in or toward a better position赚；占优势