On account of its chemical structure and the spatial relations between the constituent molecular parts, it is capable of self-duplication, correct in every detail.
由于其化学结构和组成分子间的空间关系的缘故，它能精确地自我复制。
2
Successful model must be with a pattern of rapid reproduction, and this model should have the ability of self-control so as to achieve the standardization of duplication.
The Angle spectrum analysis of self-image of double frequency grating is given. The grating duplication and the measurement of lens focus are obtained by Tablot effect of holographic phase grating.