What do you mean, broken volume?

"Don't use its dross to cover up its volume and take its spirit." It is a sentence that left a deep impression on many people in ancient poetry, so "there is no need to cover up its volume with its dross and take its spirit." What exactly does it mean? In fact, "there is no need to cover up its volume with its dross and take its spirit." It means that when you read a book, you should learn its essence, not all, and adopt the dross. In short, you must apply what you have learned. This sentence comes from Poems in the Garden by Yuan Mei, a poet in the Qing Dynasty, which covers all aspects of poetry and is a comprehensive poem.