1.In micrographics, a measure of the remoteness of the copy from the original material, the first microfilm representation being the first generation microfilm.
在微照相技术,度量副本离原远近的程度。第一次微后的胶片为第一代微胶片。
2.In micrographics, a specific method of computer output microfilming in which a beam of electrons is directed onto an energy sensitive microfilm.