The process is one of active motility rather than passive extrusion by the hydrostatic pressure of the blood.
这个过程是主动运动，而不是由血液的流体静力压所致的被动挤压过程。
Because does not have the factor existence which the venous pressure and the blood capillary hydrostatic pressure advances.
因无静脉压及毛细血管流体静压增高的因素存在。
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