gǔdài / biānjiāng / yídàn / chūxiàn / fēngyān / fùjìn / de / jūnduì / jiù / bìxū / lìjí / zuòhǎo / fángyù / zhǔnbèi

古代边疆一旦出现烽烟，附近的军队就必须立即做好防御准备。

Whenever beacon fires appeared along the ancient frontier, nearby troops had to prepare for defense immediately.