美 [kiːp əˈhed]
保持领先：完成足够的任务以保持提前进度；保持领先。
跟踪新发展：跟踪研究领域或调查的新发展；监控情况。
... lie ahead即将来临；在前面 keep ahead领先；保持领先地位 on ahead抢先，提前 ...
领先；保持领先地位
You need to work hard to keep ahead.
你要努力才能保持领先优势。
You have to work hard to keep ahead in your class.
要想在全班保持成绩领先，你就必需努力学习。
You have to keep ahead of your competitors.
你必须走在你的竞争对手的前面。
And you might have kind of been projecting ahead and thinking if we keep up at this pace, pretty much we would only get to carbon by the end of the semester.
你们可能会有这种推测：,如果我们以这个速度继续下去的话，这个学期,也只能讲到碳原子。
化学原理课程节选 : 麻省理工公开课
Keep your hands up, those of you who would go straight ahead.
选择往前开的，请不要把手放下。
公正课程节选 : 耶鲁公开课
The purpose of Friday's announcement was to keep ahead of Pyongyang's military developments, Mr. Hagel said.
WSJ: U.S. to Boost Missile Defenses in Response to North Korea
The only way to keep ahead of that, even for a company has secretive as Apple, is to keep moving.
FORBES: Gizmodo's iPhone Scoop Is Legit, But Competitors May Know More
Meanwhile, get your flu shot, because the flu mutates so fast that we need a new vaccine every year to keep ahead of it.