Seven or more successive points within the same side of control Central Line.
连续七点或更多点在控制中心线的同一侧。
When overtaking on a road without a Central Line, the driver should turn on the left-turn signal and overtake from the left side of the vehicle to be overtaken.
在没有中心线的道路上超车时，应开启左转向灯，从被超车左侧超越。
Methods Measurement of 11 dental models was performed, midline of palate was defined as central line, the distance of every contact point to the midline was measured in each side.
方法测量11例骨性下颌前突伴偏斜患者治疗前模型，将上颌腭中缝作为中线标准，测量牙弓两侧同名牙接触点到腭中缝的距离，观测牙弓的对称性。
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