How　to　analytically　deal　with　the　entanglement　and　coherence　dynamics　of　separated　Jaynes-Cummings　nodes　with　continuous-variable　fields　is　still　an　open　question.　We　here　generalize　this　model　to　a　more　common　situation　including　either　a　small　or　large　qubit-field　detuning,　and　obtain　two　new　analytical　formulas.　The　X-state　simplification,　Fock-state　shortcut　and　detuning-limit　approximation　work　together　in　an　amazingly　accurate　way,　which　agrees　with　the　numerical　results.　The　new　formulas　almost　perfectly　predict　the　two-qubit　entanglement　dynamics　both　in　sudden　death　and　rebirth　phenomenon　for　detuning　interactions.　We　find　that　when　both　the　qubit-field　detuning　and　amplitude　of　coherent　states　are　large　enough,　the　maximal　entanglement　and　coherence　peaks　can　be　fully　and　periodically　retrieved,　and　their　revival　periods　both　increase　linearly　with　the　increasing　detuning.　©　2019　by　the　authors.