名词
中文翻译：Unknown
同义词：
['narrowing line', 'narrowing point', 'narrowing mark']
例句：
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1. The engineer used a narrowing mark to indicate the location of the pipe.
工程师使用一个缩小标记来指示管道的位置。
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2. During the construction process, we need to pay attention to the narrowing mark to avoid anypotential problems.
在施工过程中，我们需要关注缩小标记以避免任何潜在问题。
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3. The narrowing mark is an important tool for measuring the width of the road.
缩小标记是测量道路宽度的重要工具。