in presence短语⁹⁶⁶⁷⁷⁺⁶ 基本例句 🌏出席；当前化 An approach is proposed to estimate several differential properties, including Gaussian curvature, mean curvature and main curvature on point- sampled surfaces in presence of noise. 本文提出一种直接在点采样曲面上计算曲面的高斯曲率、平均曲率及主曲率等局部微分性质的方法。 cnki