The term clearing includes removal of above-ground obstacles to work such as trees, brush, crops, and boulders.
术语清理建管带包括：清除对管道建设工作有影响的障碍物，如树、灌木林、砾石等。
Four-brush design for fast removal of crystals accumulated at pin tips.
四刷毛设计，快速取出针尖结晶。
Four-brush design for fast removal of crystals accumulated at pin tips.
四刷毛设计，快速取出针尖结晶。
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