Fu: Tell the story directly, and spread it out for comparison. Equivalent to today's parallelism rhetoric. Comparison: analogy, metaphor. There are two kinds of sayings here, namely analogy and metaphor. In "Bi Xing", "Bi" means "metaphor". )
Xing: to nourish the spirit with things, first talk about other things, and then use association to draw out what the poet wants to express, thoughts and feelings. Equivalent to today's symbolic rhetoric. Xing means that emotion resides in image, and image is also image, so Xing has the realm of self and selflessness.