Only symplectic conservation is characteristic of discrete dynamics

Symplectic conservation is altered to "(geometric) structurepreserving" in some foreign work. "Symplectic" is a terminology, but what "structure" means here is still a fuzzy concept that can’t be stated clearly. This alteration seems to make a foreign original achievement. Hence the foreign fuzzified concept will displace the definite Chinese invention. It is very important to distinguish between Chinese original work and foreign distorted ones. The positively correct concept that symplectic conservation is characteristic of discrete dynamics, is a Chinese original one, shall not be obscured behind a foreign camouflage. "People respect those who respect themselves", which deserves enough attention of the Chinese people.