本文通过力学分析与数学推导，对已有的三种钻进模型进行了分析推理。
By using strict mechanical analysis and mathematical treatment, three rock-bit interaction models reported in literature are analyzed.
我们之所以能够钻进别人的脑袋，是因为我们大脑是个超级模拟器——比方说，我们可以建立一个模型，预测网球从哪里飞过来，然后判断是上网截击还是到底线防守。
We can do this because our brains are fantastic simulators - we can, for example, predict the paths objects will take through space and the decisions we should make now to cause a future event.
在全面分析钻井机械的组成、钻进过程的特点和人的特性的基础上，建立钻机钻进过程人机系统可靠性模型。
Based on an analysis of the composition of drilling rig, characteristics of drilling process, and human features, a reliability model of man-machine control system for drilling process is established.
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