single-line map 单线图制作
For the sample in Listing 5, a single line from the log file (as seen in Listing 2) will be the input Text object that is passed into the map method.
对于清单5中的样例，日志文件中的一行(如清单2所示)将作为传递到map方法中的输入Text对象。
A digital map based on the single line model was developed for in-vehicle navigation systems.
针对车载导航系统的需要，提出了一种基于单线模式的车载电子地图模型。
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