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present participle and gerund of duct examples
plural ductings
ductwork quotations examples
The ductings are extendable tubes made of synthetic or steel sheets (Fig. 2.1). Their cross section amounts to ca 1/60 to 1/30 of the tunnel cross section.
2005, Dimitrios Kolymbas, Tunnelling and Tunnel Mechanics: A Rational Approach to Tunnelling