seupgyeogyuip
incursion
그들은 적의 습격유입을 막기 위해 방어선을 강화했다.
geudeul-eun jeog-ui seupgyeok-yuip-eul makgi wihae bang-eoseon-eul ganghwa-haetda.
They strengthened the defense line to prevent the enemy's incursion.
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