名词
中文翻译：Unknown
同义词：
['B-line', 'B-grade line']
例句：
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1.The engineer drew a B line across the map to indicate a construction zone.
工程师在地图上画了一条B线，表示施工区域。
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2. In the B line, the temperature is consistently lower than in the rest of the area.
在B线附近，温度一直比其他地区低。
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3. The B line is used to denote the boundary between two different classes of roads.
B线用于表示两种不同等级道路的分界线。