When a rotary drilling rig is used to drill and pile, why is the hole filled with mud?

Variety School Bus and Super Flying Hero Engineering Vehicle

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There are trucks in various colors, excavators, construction vehicles, and cute trucks sleeping in t

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Get to know fire truck toys, mixer truck toys, ambulance toys, etc.

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The car crushed a pile of lighters, and the sound of explosions continued

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cool! How many marbles can 2 cleaning trucks hold in 3 trash cans? excavator construction vehicle to

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This RC excavator is so handsome, how many people like this painting

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