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n semicircular or many-sided recess with an arched or domed roof, esp at the east end of a church 半圆室（尤指教堂东端的半圆形或多边形凹室, 顶为拱形或圆形）.

approve, approve of, approved school, approving, approvingly, approx, approximate, approximate to, approximately, approximation, appurtenance, Apr, apres-ski, apricot, April, April Fool, April Fool's Day, apron, apropos, apropos of, apstream, apt, aptitude, aptitude test, aptly, aptness, Aqualung, aquamarine, aquaplane, Aquarian, aquarium, Aquarius, aquatic, aquatint, aqueduct, aqueous, aquifer, aquiline, Arab, arabesque,