异形空心纤维

locating hole【机】;location hole【机】;sprocket hole【机】

doughnut hole size

hole marker with hole sensor, data processing

plug-and-feather hole【矿】

abscess【材】;air-vent【建】;blow-hole【冶】

pin-hole leak

be in the hole

button hole deformity, boutonnière deformity