[bǐ yù]
（譬喻； 一種修辭方式） metaphor or simile; analogy; figure of speech; allegory
This is just a figure of speech
這只是一個比喻說法。
The atomic structure is often compared to a miniature solar system.
原子結構時常被比喻為微型太陽系。
We often compare the flow of electrical charges to the flow of water.
我們時常把電荷的流動比喻為水的流動。