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The problem of spectra formation in hydrodynamic approach to A+A collisionsis discussed. It is analyzed in terms of the two different objects:distribution and emission functions. We show that though the process ofparticle liberation, described by the emission function, is, usually,continuous in time, the observable spectra can be also expressed by means ofthe Landau/Cooper-Frye prescription. We argue that such an approximate dualityresults from some symmetry properties that systems in A+A collisions reach tothe end of hydrodynamic evolution and reduction of the collision rate at posthydrodynamic stageComment: 6 pages, talk presented by S.V. Akkelin during the 3rd Budapest  Winter School on Heavy Ion Physics, Dec. 8-11, 2003, Budapest, Hungar

Sudden Freeze-Out vs. Continuous Emission: Duality in Hydro-Kinetic Approach to <i≯A</i≯+<i≯A</i≯ Collisions