There has been no specific proof to these pattern. In this paper, there is a preliminary study of the composition as well as advantages and disadvantages of such models.
一些专家学者在各自的研究中提到过这些模式，但至今没有对这些模式进行具体的论证。
There has been no specific proof to these pattern. In this paper, there is a preliminary study of the composition as well as advantages and disadvantages of such models.
一些专家学者在各自的研究中提到过这些模式，但至今没有对这些模式进行具体的论证。
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