concave-surface 水面下凹
concave surface key 内凹齿钥匙
stable concave surface 稳定凹曲面
regular concave surface 规则凹坑表面
concave surface recovery 凹表面恢复
conducting concave surface 凹形接地面
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The front of ancient bronze mirrors has flat and concave surface .
古代青铜镜的镜面有平面的，也有凸面的。
This paper investigates the inverted L antennas mounted on a conducting concave surface.
系统地研究了架设在凹形接地面上的倒l天线的电特性。
Cylinder and enlarged blades are used as test models for simulating the leading edge and concave surface of the blade.
用圆柱和放大的叶片做模型，模拟叶片前缘和叶盆凹面的流动。
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