There are also some shellfish that don't move automatically, but they can travel long distances under the boat for free. What are the advantages of this writing? Write one yourself?

This sentence is personified rhetoric. The advantage of writing this sentence is to make the long-distance free travel of silent shellfish under the ship vivid, make the article interesting and stimulate the imagination of readers.

Imitate the sentence as follows:

Bai Yutang is like a woman who can smile indifferently in the wind and rain, and her charming bloom belongs to her gentleness.

This passage comes from Unit 7 of the third grade Chinese Volume II of the unified edition, Underwater World. This paper mainly describes the brightness, sound, animals and plants and mineral deposits of the seabed, introduces the relevant knowledge of the seabed, and expresses the love and praise for nature.

Extended data

Underwater world appreciation;

The opening of the text appears in the form of questions to attract attention to the main content of the article, arouse suspense, stimulate readers' interest and thinking, and play a prominent and emphasized role. The author compares the tranquility of the seabed by contrast, which shows that the sea is deep.

The fifth paragraph uses examples, figures and comparison methods in the following content to tell the great differences of marine benthos from the diversity of colors and the great differences of sizes.