However, scholars have not conducted systematic studies of the movement and they also have differences on how to evaluate it.

但学者们对这次运动的内容和表现缺乏系统的研究，在如何评价上也存在分歧。

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The producers of the electronic cigarettes have not conducted clinical studies and toxicity analysts, and consequently, the cigarettes are potentially dangerous.

电子卷烟的制造商没有进行临床研究和毒性分析，因此，这种卷烟具有潜在的危险性。

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Due to the high-dimensional mapping that neural network fits contains complex intrinsic attribute dependencies, the traditional optimization methods have not conducted the analytical study on it.

由于神经网络拟合的高维映射存在复杂的内在属性依赖关系，而传统的优化方法却没有对其进行分析研究。

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Hotel industry officials say they have not conducted surveys of hotel compliance but say all major hotel chains have made their pools accessible.

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But lawyers for the Labor Department and PBGC have stated that they have not conducted forensic audits in the past and do not have such capabilities in-house, according to Siedle.

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And they have not conducted, or at least not presented, the standard statistical tests which would allow they or us to determine whether the results were the outcome of pure blind chance.

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