单词	drillstock
释义	drillstock /ˈdrilstäk / noun The part of a drilling tool or machine that holds the bit.Between each drilling stage, however, when the drillstock of the rod-installing apparatus is disconnected from the rod to enable the addition of another section to the same, it is necessary to maintain the pressure in the tunnel by other means.
随便看	Coll. collab collabo collaborate collaboration collaborationist collaborative collaboratively collaborator collage collagen collagist collapsar collapse collapsibility collapsible collar collar beam collarbone collard collard greens collards collared collared dove collared lizard

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