The classic Chinese poem about the "straight" and the "circle"

使至塞上 [shǐ zhì sài shàng]
作者:【王维】 年代：【唐】 体裁：【五律】 类别：【边塞】
Author: Wang Wei   Time: Tang Dynasty   Genre：Five laws   Category: Bian sai

 

 单车欲问边，属国过居延。
 征蓬出汉塞，归雁入胡天。
 大漠孤烟直，长河落日圆。
 萧关逢候骑，都护在燕然。

大漠孤烟直，长河落日圆：
 

A plume of smoke rises up straightforwardly into the sky of the Great Desert while the Yellow River dimmed as the setting sun goes down.