There is a close correlation between population density and the number of fires in a given region.
一特定地区发生的火灾次数和该地区的人口密度密切相关。
2
The investigators found a significant inverse correlation between the wrinkle score and the bone density, meaning the higher the score (and the worse the wrinkles), the lower the bone density.
Different types of digitally modulated signals that have similar, if not identical, power spectral density functions can have highly distinct spectral correlation functions.