介词短语
中文翻译：在
同义词：
['before', 'in front of', 'ahead of例句：1. He arrived at the airport ahead of schedule.（他提前到达了机场。）']
例句：
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1. He arrived at the airport ahead of schedule.
他提前到达了机场。
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2.The bus was late, but we arrived ahead of time.
公共汽车晚点了，但我们提前到了。
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3. She moved her desk to the front of the classroom so she could see better.
她把桌子搬到教室前面，以便看得更清楚。