“…Here, 1 < p < ∞ and 0 < λ < n and the quantity of (1.1) is the (p, λ)-Morrey norm, denoted by f L p,λ . In recent years, more and more researches focus on function spaces based on Morrey spaces to fill in some gaps in the theory of Morrey type spaces (see, for example, [10,12,13,14,15,16,18,20,26,28,32]). Moreover, these spaces are useful in harmonic analysis and PDEs.…”