Capacitance vessels constrict, increasing the backflow of venous blood.
容量血管收缩，静脉回流量增加。
2
Using baicalin as the standard sample, the flavone substances in pollen of Yunnan pine were determined through methyl alcohol backflow extraction and ultraviolet spectrophotometer.
以黄芩甙为标样，对云南松花粉中黄酮类化合物采用甲醇回流提取，用紫外分光光度法进行测定。
3
If two flying insect populations took up residence in separate nearby valleys, chances are that individuals from each population would fly back and forth, continuing gene flow.