A technique that allows the elucidation of the three-dimensional structure of proteins, DNA, or other biomolecules at atomic-level resolution.

For, as must be emphasized again, the reality the elucidation and interpretation of which is the task of praxeology is congeneric with the logical structure of the human mind.

This text mainly introduced its system structure and functions, and to now the control principle of the unit carried on the elucidation.