First of all, we need to make it clear that Lang Lang and Lang Lang have their own meanings and usages. Lang Lang refers to a bright appearance, while Lang Lang refers to a loud voice. Therefore, from the semantic point of view, both Langshu clear voice and Langshu clear voice have their rationality.

"Lang Shulangsheng" and "Lang Shulangsheng" are both wrong expressions. The correct expressions are "Lang Shu Lang Sheng" and "Lang Shu Lang Sheng". The specific differences are as follows:

First of all, express different meanings

1, the sound of the book is loud and clear: it describes the crisp and loud sound of reading.

2, the sound of the book is loud: describe the sound of reading.

Second, the parts of speech are different.

1, book sound lang lang: lang lang is an overlapping adjective.

2. Book sound: Lang Lang is an onomatopoeic word, an onomatopoeic word.

example sentence

1, the school has heard the sound of reading, making the whole campus so sacred.

2. She always appears quietly in the sound of a book, and finds out those students who don't read, read aloud, play, fight, play and sleep in the morning reading class.

I met you on campus in a hurry that year, with a loud book.

The fun of that video game, he is busy with drawings every day, thinking about the scene of roaring factory machines and noisy school books.