double concave meaning in English
双凹的
Examples
- Just as a double convex lens enlarges , so a double concave lens reduces
正象双凸透镜可以放大那样，双凹透镜也可以缩小。 - 7 . technology of double self - standing ouch , double concave - convex buckle device is in the lead at home , which can truly make pouch by one machine with multiple functions
7双自立袋，双凹凸扣装置技术属国内领先水平，真正实现了一机多功能制袋。