The scales of the trays of two ruler take days as scale unit, and the scales are respectively distributed around two concentric circles.
两个尺盘的刻度均以日为刻度单位，且分别成圆周状布置在两个同心圆上。
The scales of the trays of two ruler take days as scale unit, and the scales are respectively distributed around two concentric circles.
两个尺盘的刻度均以日为刻度单位，且分别成圆周状布置在两个同心圆上。
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