常見例句雙語例句The drill bit is a direct tool for rock breakage. The rate of penetration is closely related with the drill bit as well as the mechanical properties of the rocks.鑽頭是直接破碎井底巖石的工具，鑽井速度的快慢不僅與鑽頭有關，而且與所鑽巖石的力學性質(zhì)密切相關。lib.swpu.edu.cn 返回 direct breakage