最后综述论文的研究结论，指出其局限性及有待进一步研究的问题。

Last, review the research paper content, draw a conclusion and indicate the paper's limitations and the need of further study.

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该文首先简要介绍了VB6.0自带的数据控件与数据库连接的方法，并指出其局限性。

This paper first gives an introduction to the method of making a database connection from the VB6.0's built-in Data Control, and its limitations.

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但是，地膜也有其局限性。自然资源专家指出，杂草可以在地膜里传播，还可以通过土壤，谷物，干草和动物传播。

But even mulch has its limits. Natural resource specialists point out that weeds can be transported in mulch. This is also true of soil, grain, hay and animals.

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