firmer gouge ; bent chisel
... 弯尾夹头 bent-tail carrier 弯凿 bent chisel 弯折角 bending angle ...
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内圆弯凿 scribing gouge ; scriaol gouge
外圆弯凿 firmer gouge
弯头捻缝凿 crooked iron ; bent iron
长弯捻缝凿 long bend calking tool
弯头圆凿 bent gouge
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这些水渠往往要凿通岩石，并需要地道、引水沟、弯管、渡漕和混凝土水道。
These canals are frequently excavated through rock, and require tunnels, flumes, syphons, aqueducts and open concrete-lined channels.
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