Another is caused by internal friction in soil and externalfriction between soil and track-plate face.
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。
2
In contrast, locking plates follow the biomechanical principle of external fixators and do not require friction between the plate and bone.
与之相比，锁定钢板外固定架的生物力学原则相仿，无需钢板与骨之间的摩擦力。
3
The results show that the shock standoff distance, skin friction coefficient and surface heat flux all increase with the strengthening of the external dipole magnetic field.