名词
中文翻译：遮光标记
同义词：
['light-blocking mark', 'light-blocking device']
例句：
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1. The shutteringmark on the wall indicates that the room is not to be entered until further notice.
墙上的遮光标记表明房间在另行通知前不得进入。
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2. The light-blocking mark on the door prevents us from seeing what's behind it.
门上的遮光标记阻止我们看见它后面的东西。
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3. The engineer used a light-blocking mark to indicate where the power lines should be installed.
工程师使用遮光标记来指示电线应该安装在何处。