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中文版 | ENGLISH   　●Method Overview　　●Machines　　●Flow Chart　　●Photo   　》Method Overview     Method Overview：   RCD(Reverse Circulation Drilling) method makes use of hollow drill bits to break into ground and suck out the broken rocks and soil to the surface and into the sludge and water tanks for them to settle, water then circles back to maintain the water level within the drilling hole, preventing underground collapsing.       The audio-visual worker law explaining：   Watch On-line( In the preparatory ) Download the file( In the preparatory ) movie_04.wmv