in front of or before
在…前面,在…之前
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she walked ahead of him along the corridor. 她沿着走廊在他前面走。</Italic>
in store for; awaiting
准备着;等待着
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we have a long drive ahead of us .我们还要开很久的车才能到。
earlier than planned or expected
提前
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elimination of trade barriers came five years ahead of schedule .贸易壁垒的取消比计划提前了五年到来。