名词
中文翻译：线索标记
同义词：
['cue', 'signal', 'indicator']
例句：
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1.The cue mark on the wall indicates that we should turn left.
墙上的线索标记指示我们应该左转。
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2. The cue mark helped me to find my way back to the main road.
线索标记帮助我找到了回主路的路。
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3. The cue mark was so faint that I couldn't see it at first.
线索标记太模糊了，我一开始看不见。