Back Cover: Poly(N‐isopropylacrylamide‐co‐benzo‐12‐crown‐4‐acrylamide) (PNB12C4) copolymer can recognize and respond to both γ‐CD and Na+ based on the B12C4 role transformation between host and guest units. When γ‐CD and Na+ coexist with PNB12C4, competitive complexation actions of B12C4 toward γ‐CD and Na+ finally form an equilibrium of 2:2:1 γ‐CD/B12C4/Na+ composite complex regardless of the complexation order, and PNB12C4 copolymer finally reaches the same equilibrium state. Further details can be found in the article by Y. M. Wang, X. J. Ju,* Z. Liu, R. Xie, W. Wang, J. F. Wu, Y. Q. Zhang, and L. Y. Chu on page 1280. [ABSTRACT FROM AUTHOR]