However, the method is complicated to operate and it is quite difficult to progress its data.
但此方法操作繁琐，数据处理较难。
Discontinue use and contact the supplier if a cylinder valve is difficult to operate.
如果钢瓶阀门难于操作，停止使用并同供应商联系。
The operation of complicated lumbar spinal stenosis is difficult to operate and has high risk.
复杂性腰椎管狭窄症手术难度大，风险高。
The operation of complicated lumbar spinal stenosis is difficult to operate and has high risk.
复杂性腰椎管狭窄症手术难度大，风险高。
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