主塔, 城堡主楼
the strongest part of a castle or other fortification, housing the main living quarters and defensive structures.
示例:• The invaders attacked the castle's keep.入侵者袭击了城堡的主塔。• The ancient keep stood tall against the sky.古老的主塔高耸入云。同义词:donjonstrongholdcitadelfortresstower