Concentration method is to keep the original meaning of the text at the same time simplify as much as possible, both to retain the meaning of the original language and ensure major stylistic change.
The enrichment method is to simplify the text while retaining the original meaning as much as possible, so as to preserve the meaning of the original and ensure that the main style remains unchanged.
The enrichment method is to keep the original meaning as much as possible while simplifying the text, so as to keep the original meaning and keep the main style unchanged.