concave slide

基本解釋

The ejection mechanism used pin ejector to pull the plastic parts out with move slanting slide simultaneously leaving circular arc concave position.
脫模機構(gòu)采用推桿推出塑件的同時帶動斜滑塊脫出圓弧形凹位，使脫模機構(gòu)簡單實用。
That far up, Evenson said, glaciers tend to be concave, allowing rocks to slide far along their surfaces. Lower down, the glaciers are more likely to be convex, trapping rocks near the edges.
最后，他說道，巖石肯定落到了融化速度快過結(jié)冰速度的冰川區(qū)域之上的某處，冰川上部往往是凹陷的，這使得巖石可以沿著表面一直滑落很遠，而冰川較低處凸出的可能性更大，使得巖石在接近邊緣處停止滑落。