n.（古代用以发射石弹等的）抛石机，投石器，弩炮
Ballista Towers provide the defenders with enough firepower to keep at bay.
箭塔为守军提供强大远程火力,密集杀伤来犯敌军.
Ballista: Ancient missile launcher designed to hurl long arrows or heavy Balls.
投石机: 古代投掷物体之发射器,用作发射长箭或重型球状物.
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