allegory
n[U, C]
(style of a) story, painting or description in which the characters and events are meant as symbols of purity, truth, patience, etc 寓言(体), 讽喻(风格)(以人物和事件象徵纯洁, 真理, 耐心等的故事, 绘画或叙述).
and since most medical men in the Health Services are overworked and have little time for offering time-consuming and little-appreciated advice on such subjects as diet,