At present, most of the reports about the mechanism of HBV intrauterine transmission are descriptive studies.

有关HBV宫内传播机制，国内外文献多为描述性研究。

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And I'm not expecting journalists to go to academic research databases to conduct large complex descriptive studies.

并且我不希望记者们进入学术研究的数据库去做更大更复杂的描述性的研究。

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It is acknowledged that, in many areas, evidence is generally confined to case reports, observational or descriptive studies, and poorly controlled or uncontrolled studies.

我们承认，在许多领域，事实一般只局限于病例报告，观察或描述性研究，以及不好的CONTROLLED或者UNTROLLED的研究。

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