A pentiunIII 500 can run at 8 times the speed of a DX4 100. But is also runs a lot hotter.
奔腾III 500 的速度比DX4 100 要快8倍,但运行时散发的热量要更大。
and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.
我们必须把很长的钻杆一节节地钻入地下,然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转,它的底部装有钻头。