The gas atom density exhibits a concave profile in radial direction.
气体原子密度的径向分布呈一凹形。
It is slightly elevated forwards, finishing off the concave profile of the muzzle.
这是略微高前锋，整理过的枪口凹轮廓。
The special meshing of convex and concave teeth profile makes the relative radius of curvature of the contacting point longer.
独特的凸凹啮合齿廓，使两齿轮在接触点处的综合曲率半径较大。
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