名词
中文翻译：Unknown
同义词：
['blocking indicator', 'obstruction indicator']
例句：
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1. The block indicator is used to indicate where the road is blocked.
阻挡指示器用于指示道路被阻塞的位置。
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2. The obstruction indicator indicates that there is a hazard ahead.
阻碍指示器表明前方有危险。
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3. The block indicator was removed to allow for better traffic flow.
移除了阻挡指示器以便改善交通流。