名词
中文翻译：标志更换单元
同义词：
['Sign Change Unit (SCU)']
例句：
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1. TheSCU is used to monitor the movementof traffic signs.
SCU用于监测交通标志的运动。
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2. The new SCU system will improvethe accuracy of sign recognition.
新的SCU系统将提高标志识别的准确性。
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3. The SCUis a crucial component in the development ofintelligent transportation systems.
SCU是智能交通系统发展的关键组件。