名词
中文翻译：Unknown
同义词：
['stranger', 'bystander', 'pedestrian']
例句：
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1. I saw a passer-by on the street yesterday who looked familiar.
昨天我在街头看到一个路人，觉得他很面熟。
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2. The passer-by stopped to ask for directions to the nearest hospital.
那个路过的行人停下来问路去最近的医院。
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3. The passer-by was so busy that he didn't notice me waiting for him.
那个路过的行人太忙了，没注意到我等他。