名词
中文翻译：线单位
同义词：
['thread unit', 'wire unit']
例句：
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1.The string unit is used to measure the length of a thread.
线单位用于测量线的长度。
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2. The string unit is crucial for the construction of bridges and buildings.
线单位对于桥梁和建筑的建设至关重要。
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3.The string unit is also used in the measurement of distances on a map.
线单位也用于地图上距离的测量。