Question

ahead
a.head  AHD[…-hµd“]   DJ[*6hed]  KK[*6hWd]
adv.（副词）
1.At or to the front or head.
    在前面，在前头
2.In advance; before:
    预先；在…之前：
    Pay ahead, and you'll receive a discount.
    若预先付款，你便可以享受折扣
3.In or into the future; for the future:
    在将来；为将来：
    planned ahead.
    计划未来
4.In an advanced position or a configuration registering the future:
    向前，朝前：处于前列的位置或指示未来的方位：
    Set the clock ahead.
    把时钟拨快
5.At or to a different time; earlier or later:
    或早或晚：在不同的时间；提前或推迟：
    moved the appointment ahead, from Tuesday to Monday.
    把约会从星期二提前到星期一
6.In a forward direction; onward:
    朝前；向前：
    The train moved ahead slowly.
    火车缓缓向前移动
7.In the prescribed direction or sequence for normal use:
    按常规地：为得到正常的使用而朝向规定的方向或顺序：
    You won't hear anything unless you roll the tape ahead.
    除非你把录音带往前转，否则你是不会听到任何东西的
8.In or into a more advantageous position:
    更有利：处于更有利的地位：
    wanted to get ahead in life.
    想出人头地
IDIOMS
▪be ahead: To be winning or in a superior position:
    领先，占优势：
    The home team was ahead in the second period. Your company is ahead in developing the new technology.
    主队在第二阶段的比赛中处于领先。你们的公司在发展新科技方面处于领先地位