Being able to quantify uncertainty, and incorporate it into models, is what makes science quantitative, rather than qualitative.

量化不确定性，然后将其融入到模型中去正是将科学量化的方法，而不只停留在定性的层面上。

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Part 3 is the theoretical study. Discussed the relevant methods and models of tourism space, as the basic for the latter qualitative and quantitative research.

第3部分是理论研究，论述了旅游空间的相关理论方法和模型，为后期定性研究和定量研究做了铺垫。

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Generally, passive and active fault tolerant control systems depend on system models-quantitative, qualitative or quasi - quantitative.

被动容错控制和主动容错控制多依赖于系统的模型：定量，半定量或定性模型。

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