A cylinder (Fig. 1) is a hollow tube with a closed concave base that permits the cylinder to stand upright.
钢瓶(图1)是中空的管道，封闭的底部是凹入的，这样可以直立起来。
On the base of Hertzian stress theory we developed a new kind of disk CAM mechanism whose follower has concave circle - arc bottom.
根据赫兹应力理论，提出了一种从动件接触面形状为凹圆弧底的新型盘状凸轮机构。
Results All the 48 patients healed uneventfully, ipsilateral alar base , concave columella skew, lower-nose deformity has been well corrected.
结果48例患者均一期痊愈出院，患侧鼻翼基部凹陷、鼻小柱偏斜、鼻尖低平等畸形得到良好的矫正。
A cylinder is a hollow tube with a closed concave base that permits it to stand upright.
钢瓶是中空的管道，封闭的底部是凹入的，这样可以直立起来。
The latter often shows that there is a "chop concave" on the slope base.
后者常表现为斜坡坡脚部分存在有“嵌凹”；
The latter often shows that there is a "chop concave" on the slope base.
后者常表现为斜坡坡脚部分存在有“嵌凹”；
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