- open seam，seam opening
- 开缝: slotting
- 裂缝: rent; rip; hiatus; tear; rif ...
- 开缝: slotting◇开缝槽 slot driller; 开缝机翼 slotted aerofoil
- 裂缝: 1.(裂开的缝儿) rent; rip; hiatus; tear; rift; crevice; crack; fissure 岩石的裂缝 crevices in a rock; 弥合裂缝 span a rift; 地上的裂缝 a fissure in the ground2.[地质学] fracture; rupture
- 包开缝: bagseam open
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