尽管这项研究无法证明是筛查的减少导致了诊断数的下降，但作者们认为这是最合理的解释。

Although the study could not prove that the drop in screening caused the drop in diagnoses, the authors said it was the most plausible explanation.

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要数清震动筛的振荡数是不容易的。

It's not easy to count the number of vibrations of shale shaker.

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要数清震动筛的振荡数是不容易的。

It's not easy to count the number of vibrations of shale shaker.

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