介词
中文翻译：在
同义词：
['on', 'at', 'under', 'above', 'after', 'before']
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. She was upon her knees when she heard the news.
她听到这个消息时跪在地上。
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3. He was upon the stage performing a solo.
他在舞台上表演独唱。