When the enterprise external sourcing occurred or to send foreign goods, it is often difficult to be identified direct the network.

当企业发生对外采购业务或者对外发送货物时，往往很难是直接通过网络得到确认的。

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Hydroxypropyl methyl cellulose used in life is very wide, but in actual use process, the average person is difficult to be identified.

羟丙基甲基纤维素在生活中的使用范围很广泛，但是在实际的使用过程中，一般的人很难将它们识别出来。

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The model-free control is especially useful for real nonlinear systems whose model parameter are very difficult to be identified and time varying.

此无模型控制方法非常适用于实际的模型参数难以辨识，且是时变的非线性系统。

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Court proceedings in the Gaza Strip are not held in public, and defendants are identified only by their initials, so it can be difficult event to match announcements of executions even with previous news of arrests or convictions, our correspondent says.

BBC: Hamas hangs Gaza prisoners, including one 'collaborator'