concave-convex soil 凹凸棒土
concave-convex curve 凸凹曲线
concave-convex system 凹凸镜系统
trajectory concave-convex 轨迹凸凹性
Because there is no abrasion between the concave and convex, the nut is reusable.
由于凹面与凸面之间没有磨损,螺母可以重复使用。
Water surges from the cells on the inside of the leaf to those on the outside, causing the leaf to rapidly flip in shape from convex to concave, like a soft contact lens.
水从叶子内部的细胞涌向外面的细胞,导致叶子迅速地从凸向凹翻转,就像一片柔软的隐形眼镜。
Belt cupping, also called dishing, is characterized by an unintentional transversal concave or convex belt dishing over the whole belt width.
腰带拔罐,也被称为凹陷,特点是由无意的横向凹或凸的皮带在整个皮带宽度抛出。
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