According to the properties of basic points of lens group and the varifocal principle of lens group,a varifocal optical system which has a fixed image space principal point has been designed.
根据透镜组基点性质和透镜组可变焦原理,设计
主点变焦光学系统。
According to the properties of basic points of lens group and the varifocal principle of lens group,a varifocal optical system which has a fixed image space principal point has been designed.
根据透镜组基点性质和透镜组可变焦原理,设计主点变焦光学系统。
明：以上例句、词性分
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