In his poem "The Road not Taken," the American poet Robert Frost wrote: "Two roads diverged in a yellow wood, / And sorry I could not travel both / And be one traveler, / Long I stood / And looked down one as far as I could / To where it bent in the undergrowth.
正如美國詩人羅伯・佛洛斯特在「沒有走的路」詩中所描述：「黃樹林裡分叉兩條路，很遺憾，不能兩邊都踏行。