This sentence vividly describes the chubby little pearl bird, and compares the chubby pearl bird to a small ball, which highlights the loveliness of the pearl bird.

Metaphorical sentence is a common rhetorical device, which means to replace abstract and difficult things with simple, concrete and vivid things. The basic structure of figurative sentences is divided into three parts: noumenon (figurative thing), figurative words (words expressing figurative relations) and figurative body (figurative thing).

Extended data:

The function of metaphor

(1) Metaphorical reasoning is easy to understand and accept.

(2) Metaphor can tell some unimaginable things in detail and explain them with other similar things, which makes people more clear.

(3) Metaphor can be visualized and leave a deep impression on people.

(4) Play the role of decorating articles.

(5) Make things vivid and vivid, highlight features, render the atmosphere and set off the side.

Metaphor is a common analogy, that is, a rhetorical device that compares a specific, simple and familiar thing or situation with another abstract, abstruse and unfamiliar thing or situation.

Metaphor makes people easy to understand, can turn abstract into concrete, turn abstruse into simple, and can also make people associate and imagine. There are often figurative words in figurative sentences, such as "image", "image", "image", "yes", "become like" and "really like".