名词
中文翻译：标志检查指示器同义词
同义词：
['sign indicator', 'check indicator']
例句：
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1. The sign check indicator is essential for ensuring safe passage.
标志检查指示器对于确保安全通行至关重要。
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2. The check indicator on the doorbell helps to prevent unauthorized entry.
门铃上的检查指示器有助于防止未经授权的进入。
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3. The engineer used the check indicator to ensure that all systems were functioning properly.
工程师使用检查指示器来确保所有系统都正常运行。