- Working medium inlet and exhaust non-return valve s balance hole for Stirling engine is introduced.
- Axial force is balanced by back vane or balanceable hole, for the specification with big radial force; we adopt double-wear passage design.
- His strength in a crisis is an ace in the hole.
- He chiseled a hole in the door to fit a new lock.
- The bird picked a hole in the ice with its beak.
- The child has picked a hole in his new jumper.