炮兵部队用重型火炮轰炸了敌军阵地。
The ___artillery units bombarded the enemy positions with heavy guns.
他在炮兵部队服役了三年，学会了如何操作重型火炮。
He spent three years in the ___artillery, learning how to operate heavy cannons.
飞行员报告在执行任务时遭到地面炮火射击。
The pilot reported taking fire from ground-based ___artillery during the mission.
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