Average network time - Displays the average time spent waiting on the network for completed transactions within the selected time interval.

平均网络时间：显示所选时间间隔已完成的事务花在等待网络上的平均时间。

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Result: 1. The image change: the height of lumbar vertebrae interval of all cases have losing in various degree after operation, 3 years after the operation lose 26% on average.

结果：1）影像学改变全部病例的施术腰椎间隙高度在术后均有不同程度的丢失，术后3年平均丢失26％。

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