预留螺丝孔位，方便安装。

Screw hole is prepared, so installation is easier.

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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.

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有一位很善良的姓孔的老妇人。

There was one nice old lady named Kung.

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有一位很善良的姓孔的老妇人。

There was one nice old lady named Kung.

youdao