动词
中文翻译：阻塞信号
同义词：
['block', 'jam', 'obstruct例句：1. The traffic police are blocking the road to control the flow of vehicles.（交通警察正在封锁道路以控制车辆流动。）']
例句：
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1. The traffic police are blocking the road to control the flow of vehicles.
交通警察正在封锁道路以控制车辆流动。
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2.The engineer blocked the signal to prevent the train from stopping.
工程师阻止了信号，以防止火车停止。
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3. The construction workers were blocking the signal to ensure safety during the construction.
建筑工人在施工期间阻塞信号以确保安全。