《史记·七十列传·李斯列传》
秦国的疆域并不是不广阔，还要在北方驱逐胡人，貉人，在南方平定百越，以显示秦国的强大。
地不广，又北逐胡、貉，南定百越，以见秦之彊。
The territory of the Qin State is not vast, but it is necessary to expel the Hu people and Hai people to the north, and pacify Baiyue to the south to show the strength of the Qin State.