concave slide

基本解释

The ejection mechanism used pin ejector to pull the plastic parts out with move slanting slide simultaneously leaving circular arc concave position.
脫模機搆採用推杆推出塑件的同時帶動斜滑塊脫出圓弧形凹位，使脫模機搆簡單實用。
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.
最後，他說道，巖石肯定落到了融化速度快過結冰速度的冰川區域之上的某処，冰川上部往往是凹陷的，這使得巖石可以沿著表麪一直滑落很遠，而冰川較低処凸出的可能性更大，使得巖石在接近邊緣処停止滑落。