A small tower, usu. at the corner of a building, sometimes merely decorative.

塔楼；(建筑物的)角楼。

A towerlike structure, which may be rotated, of thick steel, mounted on battleships or in fortifications and containing heavy guns.

炮塔。

Pivoted attachment, as on a lathe or camera, holding several different tools or lenses that can be quickly rotated into place.

(车床或照像机上的旋转式)模子或透镜交换装置。