... 直接发送红外辐射仪：direct read-out infrared radiometer(DRIR) 直接断裂：direct breakage 直接读数压力计：visual readout gauge ...
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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.
钻头是直接破碎井底岩石的工具，钻井速度的快慢不仅与钻头有关，而且与所钻岩石的力学性质密切相关。
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