先头的英文：
ahead; before; in advance; in the past

参考例句：
  • The position of the forward infantry was overrun By large numBers of enemy troops at dawn.
    这支先头步兵在拂晓时被大举进攻的敌军打垮了
  • "Keep at a trot, and you shall have a double fee."
    “再照先头那样快步跑，酒资加倍。”
  • At this word, Jean Valjean, who was dejected and seemed overwhelmed, raised his head with an air of stupefaction
    冉阿让先头好象是垂头丧气的，听了这称呼，忽然抬起头来，露出大吃一惊的神气。
ahead是什么意思：
adv. 在（某人或某事物的）前面；提前；预先；占优势；领先
  • An outstanding product ahead of the times (ahead of our times)
    走在时代尖端的产品
  • The tide of revolution is surging ahead.
    革命的洪流奔腾向前。
  • Not far ahead was a cluster of trees.
    前面不远有一丛树林。
before是什么意思：
prep. 在…之前；优于，先于；当面
conj. 在…之前
adv. 先前，从前
  • Rain before seven;fine before eleven
    雨过天晴
  • They corned their horses before the journey.
    他们在启程前用玉米喂马。
  • The army was arrayed before the commander.
    部队在指挥官前列好阵势。
advance是什么意思：
v. （使）前进；发展；推进；预付；提出；提前；进展；上涨；被晋升；贷（款）
n. 前进；发展；预付款；增长
adj. 预先的；先行的
  • Prices are advancing.
    各种物价都在上涨。
  • The advance was sounded.
    进军号吹响了。
  • Petroleum is on the advance.
    石油价格正在上涨。

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