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雷达卡
原文有做进一步解释，不过我还是没能看明白
For instance, consider the following two dimensions “peak noise level during the night” and “noise level during the whole day”. Whichever the average noise during the day, low peaks during the night are always preferred to high peaks – this is an example of ordinal independence. However, if the difference of attractiveness between two night peak levels depends of the average noise level during the whole day, cardinal dependence occurs.
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