伸缩圈 expanding ring ; expansion ring ; expansion loop

缩小光圈 stop down

缩小圈选 contract marquee

收缩光圈测光 Stop-down metering

伸缩垫圈 [机] expansion bead

压缩胀圈 compression ring

缩减圈矩阵 [数] reduced cycle matrix

最小垫圈压缩 minimum gasket compression

压缩线圈 collapse coil ; coil collapse