Constant: Specifies the width of each data-partition range when the automatically generated form of the syntax is used.
Constant：在使用语法的自动生成形式时，指定每个数据分区范围的宽度。
It consists of outer layer sealing constant temperature jacket, middle layer objective sleeve and inner layer as lens frame to partition and fix optical lens elements.
它由外层密封恒温外套、中间层镜筒、内层为分隔固定光学透镜元件的透镜框组件组成。
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