zhè / ge / guó / jiā / céng / jīng / shí / xíng / mù / bīng / zhì / gǔ / lì / nián / qīng / rén / zì / yuàn / cān / jūn

这个国家曾经实行募兵制，鼓励年轻人自愿参军。

This country once operated a mercenary system that encouraged young people to join the army voluntarily.