介词
中文翻译：在
同义词：
['on', 'at', 'regarding', 'concerning']
例句：
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1. The sun rises upon the horizon every morning.
太阳每天早晨在地平线上升起。
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2. He decided to take a vacation upon receiving his promotion.
他决定在获得晋升后去度假。
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3. The company is considering purchasing a new computer upon its arrival.
公司正在考虑在新电脑到达时购买它。