多联式(VRV)空调系统是一种可以调节制冷剂流量的空调系统，可以减少无效能源的浪费，提高能源的利用率。

Varied refrigerant volume (VRV) air-conditioning system's refrigerant flow rate is adjustable, so it can reduce ineffective energy waste and improve energy efficiency.

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缺点则是工作阶段状态的无效率使用可能会导致不良的效能。

The disadvantage is that inefficient use of session state can lead to poorer performance.

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结果31例中，22例的疗效能够维持，或继续有所好转，占71％；9例的症状稍见加重，列为无效，占29％。

Results: Of total 31 cases, 22 cases (71%) can maintain their original status, and there were some exacerbation in the symptoms in the other 9 cases (29%).

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