Pointing out the background of the problem, the purpose, the significance and the research method.

指出了本课题提出的背景，研究的目的与意义，研究方法等。

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Analysis of the current popular method of access control, pointing out that their deficiencies.

分析了当前流行各种访问控制方法，指出了它们的不足之处。

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Analysis of the current popular method of access control, pointing out that their deficiencies.

分析了当前流行各种访问控制方法，指出了它们的不足之处。

youdao