换句话说，大自然是通过让大部分死亡的生存竞争——“血红的爪和牙”来决定生存和繁殖的优势。
In other words, nature tests its creations by killing most of them quickly-the battle "red in tooth and claw" that determines reproductive advantage.
本文通过焊接试验、显微分析和磨损试验论述了以铬、镍、铁基合金代替钴、铬、钨合金作石油钻头牙爪堆焊耐磨合金的问题。
In this article we discussed the possibility of replacement of cobalt alloy by Cr-Ni iron Base alloy in drill bit bearing on the basis of welding test, wearing test and microscopic examination.
分析了牙轮钻头安装和磨损间隙引起牙轮相对牙爪轴线的平移和倾斜对相邻锥体上球齿间隙的影响，通过计算，当牙轮、牙爪轴线轴向、径向平移使球齿的趋近量有抵消的趋势；
The paper analyses the effect of translation and offset angle of the cone axis to shaft one on the gap variation between two ring-button, which position on two cones.
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