Due to the difference of the mileage between inside lane and outside lane, the errors in the long-distance positioning have been accumulated and positioning accuracy is getting lower and lower.
然而实际道路中弯道也占了很大一部分，由于内外道里程的差距，使得光电编码器测距仪在长距离定位中累积误差，定位精度越来越低。
NWA mileage can be accumulated to Delta's membership card if you already have one.
预订人员会把你的卡号输入预订系统，就可以积累里程了。
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