liǎng / guó / biān / jìng / xiàn / shàng / měi / gé / yí / duàn / jù / lí / jiù / lì / zhe / yì / gēn / jiè / zhuāng

两国边境线上每隔一段距离就立着一根界桩。

A boundary marker stands at regular intervals along the border between the two countries.