Allusion is a historical metaphor, of which the original scene or scenario is abstracted into a phrase or a few words and the mapping relationship with what is described is in a connotative position.
典故是一种历史化隐喻，其原义的具体情节常被抽象化，并且与所描述的现时事件发生喻义上的冲突或错置，映现关系也处于隐含状态。
The hole isn't literal; no part of the stratosphere is empty of ozone. But scientists use the hole metaphor to describe the area where ozone drops below a historical concentration of 220 Dobson Units.
这里所谓的“空洞”不是字面上含义，并不存在任何一处平流层完全没有臭氧，科学家们用空洞这一说法来描述这些臭氧浓度低于历史读数220多布森单位的区域。
Scientists use "hole" as a metaphor for the area in which ozone concentrations drop below the historical threshold of 220 Dobson Units.
科学家们用“空洞”一词表示臭氧浓度低于220个多布森单位（多布森单位是用来度量大气中臭氧柱尺度的单位。
One cause of this is the use of metaphor with cultural, social or historical background.
违背原因其中之一是因为使用了含文化，社会或历史背景的隐喻。
One cause of this is the use of metaphor with cultural, social or historical background.
违背原因其中之一是因为使用了含文化，社会或历史背景的隐喻。
应用推荐