An improved theodolite fixed with a simple laser direction indicator was introduced.

介绍了用一种简易激光指向器改装经纬仪，使普通经纬仪带有激光指向器。

youdao

An improved theodolite fixed with a simple laser direction indicator was introduced.

介绍了用一种简易激光指向器改装经纬仪，使普通经纬仪带有激光指向器。

youdao