Arcadian       
adjective  literary uk/ɑːˈkeɪ.di.ən/ us/ɑːrˈkeɪ.di.ən/
 田园牧歌式的;世外桃源的
showing or relating to an image or idea of perfect countryside life
  He described a scene of Arcadian tranquillity. 他描述了一幅世外桃源般的宁静景象。 
 His friends flocked to his country house, drawn by the Arcadian atmosphere there.  他的朋友们纷纷涌向他的乡间别墅,被那里田园牧歌般的生活所吸引。 
 See: Arcadia
 - More examples
- The canvas shows a shepherdess and three shepherds in an Arcadian landscape.
- His upbringing was less Arcadian then his parents' had been.
- Her photographs exude a soft, Arcadian innocence.