名词
中文翻译：单向标志
同义词：
['directional sign', 'unidirectional sign']
例句：
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1. The traffic policeposted a one-way sign to guide pedestrians.
交通警察放置了一个单向标志来引导行人。
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2. The road was closed due to an accident and there was a one-way sign posted.
由于事故，道路被封闭了，并放置了一个单向标志。
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3. The construction site had a one-way sign indicating the direction of the new road.
施工现场有一个单向标志指示新路的方向。