Pressure is applied with the thumb to restrict blood flow returning from the distal limb, causing the vein to engorge with blood.
压力是运用拇指，限制返回的血流量从远端肢体，造成静脉血液。
Pressure is applied with the thumb to restrict blood flow returning from the distal limb, causing the vein to engorge with blood.
压力是运用拇指，限制返回的血流量从远端肢体，造成静脉血液。
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