n.再循环；回流；信息重记；信息重复循环
However, each installation should be evaluated for its own recirculation requirements of gpm and pipe resistance. 但是，每次安装都需要对再循环要求的流量和管道对流体的阻力进行评估。
If air is recirculated to production areas, measures shall be taken to control recirculation of dust from production. 如果空气是再循环到生产区，须采取措施控制从生产区带来的尘埃。
As the jet angle decreases, the recirculation zone on the left side becomes smaller than that of the right side. 当射流倾角减小时，左侧回流区的范围变小，而右侧的回流区增大。
