With the deeper research of interval curves and interval surfaces, people begin to approximate curves (surfaces) with interval curves (surfaces).
随着对区间曲线曲面的深入研究，人们开始用区间曲线曲面来逼近曲线曲面。
Such as deeper scars require two or more pigments and treatment, each treatment at an interval of months or so.
如较深层色素及疤痕需二次以上治疗，每次治疗需间隔二个月左右。
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