蘇軾 題畫詩 意境拓展 詩中有畫 三遠 尺幅千里 虛實相成 最富孕育性之頃刻 Su Shi Poems inscribed on paintings The nelargement of artistic mood Painting within poetry Three perspectives Epitome of macro-panorama in micro-scenery Complement of Xu and Shi The most-promising-potential instant