其二为由土壤内摩擦力及土壤对履带板的外摩擦力所产生的推进力。

Another is caused by internal friction in soil and external friction between soil and track-plate face.

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其二为由土壤内摩擦力及土壤对履带板的外摩擦力所产生的推进力。

Another is caused by internal friction in soil and external friction between soil and track-plate face.

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