It also includes removal of tree stumps and roots in the ditch line that would interfere with operation of ditching machine.
还包括清除在挖管沟范围内影响挖沟机工作的树桩和树根。
It also includes removal of tree stumps and roots in the ditch line that would interfere with operation of ditching machine.
还包括清除在挖管沟范围内影响挖沟机工作的树桩和树根。
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