The complex internal flow has made volute to be one of the component costing most loss.
蜗壳内部的流动现象十分复杂，是损失最大的元件之一。
A complex system has the properties of multi-component, multi-function and multi-failure mode, and its failure may cause serious consequence in terms of safety and economy loss.
复杂系统具有多部件、多状态、多故障模式的特点，其故障往往会产生重大的安全性后果或造成经济损失。
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