《史记·七十列传·司马相如列传》
树木高低不齐，环绕着后宫；众多草木重叠累积，覆盖着山野，沿着溪谷生长，顺着山坡，直下低湿之地，放眼望去，没有边际，仔细探究，又无穷无尽。
柴池茈虒，旋环後宫，杂遝累辑，被山缘谷，循阪下隰，视之无端，究之无穷。
The trees are of different heights, circling the back palace. Numerous trees and grass overlap and pile up, covering the mountains and countryside, growing along the streams, following the hillsides, and going straight down to the damp areas. As far as the eye can see, there is no end, and if you explore it carefully, it is endless.