coring bit

取芯钻头

cor anglais, coracle, coral, coral island, coral reef, corbel, cord, cordage, cordial, cordiality, cordially, cordite, cordon, cordon bleu, corduroy, corduroy road, core, CORE (also Core), corgi, coriander, Corinthian, cork, corkage, corked, corkscrew, corm, cormorant, corn, corn on the cob, corn pone (US also pone), corn-cob, corn-exchange, cornea, corneal, corned, cornelian, corner, corner-stone, cornerstone, cornet,