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In socialist countries, work is the role of each worker in social work to embody social value and self-worth. Work is the process by which laborers convert their production data into living materials through labor (including manual labor and mental labor) to satisfy people's livelihood and continue social development. There is no such thing as a high or low level of work. In geometry, the rigid motion is described as A mapping of the plane to its own and the distance between A and B is the same as that of A'=M(A),B'=M (B).