预留螺丝孔位，方便安装。
采用履带行走机构，移动孔位方便，快捷。
With crawler, it is easy and fast to find out the drill hole position.
保持孔位精度跟计算机设计值尽可能接近是关键。
It also is critical to maintain the accuracy of the aperture position as close to the computer-generated design as possible.
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