旋转炮塔用于观察等的小型圆形或半圆形建筑物，装在有履带的装甲车上。
A small rounded and domed structure, as for observation, on a tracked, armored vehicle.
鼓一种打击乐器，由中空的圆柱或半圆及紧绷在一端或两端的鼓膜组成，用手或棍击打演奏。
A percussion instrument consisting of a hollow cylinder or hemisphere with a membrane stretched tightly over one or both ends, played by beating with the hands or sticks.
结果：常规食管X线钡餐造影示腔内型16例，表现为圆形或半圆形充盈缺损，腔外型8例，表现为局部轻度受压。
Results: 16 cases intracavity type show with round or half-round filling defect on X-ray image, 8 cases extra cavity type with light press partly in barium meal examine.
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