Read Edit View history 凿岩 záoyán rock drilling Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 凿岩/鑿岩 · záoyán · rock drilling 2026/03/04 凿岩 / 鑿岩 záoyán rock drilling (rock) drilling 这里的硬度很高，增加了凿岩的难度。 created sense Mar 4, 2026, 02:25 AM