暗喻是将两种有共同点的不同事物进行隐晦比较的修辞手法。

A metaphor is a trope or figure of speech in which an implied comparison is made between two unlike things that actually have something in common.

youdao

文艺是用一种独特的暗喻形式来表现人类的生命体验和生命意志的。

Literary always expresses the human experience of life and its will of life in a special metaphorical form.

youdao

But is has another sense which is not a rhetorical sense, because metaphor is sort of the heart of rhetoric, the rhetorical sense A is B--when, by the way, A we know perfectly well that A is not B. How can A be B? A is only A.

但是is有另外一个意思，修辞之外的一种意思，因为暗喻差不多可以说是修辞的中心，修辞中所说的A是B，顺便说一下，我们十分清楚地知道A不是B，A怎么能是B呢，A就是。

耶鲁公开课 - 文学理论导论课程节选