聚焦目镜提供了一个尖锐的，容易阅读的规模，这是设计的半透明蓝色背景，所以你不需要有指向仪在某一个方向使您读。

Focusing eyepiece provides a sharp, easy-to-read scale, which is designed with semi-transparent blue background so you don't have to point the instrument in a certain direction to get your reading.

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收敛思维分为静态收敛与动态收敛，具有聚焦性、指向性、综合性、程序性、继承性、推理性等特点。

Convergent thinking divided into static and dynamic convergence which has focus, direction and comprehensive, procedures, inheritance, and other characteristics.

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