介词短语
中文翻译：在门上
同义词：
['on thedoor', 'on the doorstep']
例句：
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1. She was so excited thatshe ran to the door and knocked onit.
她非常兴奋，跑向门并敲门。
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2. The old man sat on thedoorstep, watching the street.
老人坐在门阶上，看着街道。
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3. He stoodon the doorstep, waiting for someoneto come out.
他站在门阶上，等待有人出来。