名词
中文翻译：Unknown
同义词：
['control', 'regulate', 'manage', 'govern', 'restrain', 'impede']
例句：
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1. The engineer needs to block the valve to prevent the leak.
工程师需要堵住阀门以防止泄漏。
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2. The government should block any illegal activities that threaten national security.
政府应该阻止任何威胁国家安全的非法活动。
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3. The traffic police blocked the road to control the flow of vehicles.
交通警察封锁了道路以控制车辆流动。