  Wang and Lih in 2002 conjectured that every planar graph without adjacent
triangles is 4-choosable. In this paper, we prove that every planar graph
without any 4-cycle adjacent to two triangles is DP-4-colorable, which improves
the results of Lam, Xu and Liu [Journal of Combin. Theory, Ser. B, 76 (1999)
117--126], of Cheng, Chen and Wang [Discrete Math., 339(2016) 3052--3057] and
of Kim and Yu [arXiv:1709.09809v1].
