But so far, most of the appraisal methods remain in the appraisal towards single business only, furthermore, these methods conduct the analysis from the qualitative perspective.
但是到目前为止，大多评价方法只使用于对单个业务的评价，且这些评价方法多数是从定性的角度进行分析。
Analysis of variations in single and multiple attributes from a stratigraphic perspective manifests regular organization and unidirectional tendencies toward limits.
运用地层观点对沉积物某种或多种性质变化进行分析，表明这些变化具有规律性并有向一些界限呈单向变化的趋势。
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