Level differentiation aims at language system, dividing tone sandhi into single-level and cross-level in accordance to their different phonological and semantic representations.
分层着眼于语言系统，根据连调在语音和语义层面上的不同表现，将其区分为单层面和跨层面两个不同的层级。
2
Mobile unit meticulous dividing is to solve how to distribute cross section's multi layer mobile output.