名词
中文翻译：循环指示器
同义词：
['circulating gauge', 'circulating indicator device']
例句：
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1. The circulating indicator on the control panel is used to indicate when the engine needs oil.
控制面板上的循环指示器用于指示发动机何时需要机油。
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2.The engineer carefully checked the circulating indicator before starting the engine.
工程师在启动发动机前仔细检查了循环指示器。
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3.The circulating indicator showed that the temperature was too high for the engine to operate safely.
循环指示器显示温度过高，对引擎的安全运行构成威胁。