It comprises of four parts, namely: flow limitation hole, focus ring, electrode ring and nozzle.
它包括四个部分：限流孔、聚焦环、电极环以及喷嘴。
But you do not have to have fill stent expansion or full stent apposition to get rid of the bulk of the flow limitation.
但是解决大部分的血流受限并不需要充分的支架扩张或良好的支架安置。
Conclusions the serum resistin level in COPD patients is decreased, which may be caused by air-flow limitation and the decrease of leptin secretion.
结论老年COPD稳定期患者血清抵抗素水平下降，气流受限和瘦素分泌的减少与抵抗素水平的下降有关。
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