To measure the difference in elevation between poles, surveyors used an opticallevel—a telescope on a level base—placed halfway between the poles.
为了测量两极之间的高程差,测量员在两极中间的一个水平基座上使用了光学水准望远镜。
2
The traditional method in Labortory is opticallevel and suspension level, but the two methods can cause larger error.
而传统的实验室方法是"光杠杆法"和"悬架水准法",这两种方法的实验结果误差较大。
3
Based on the conventional paraffin sectioning method, observation was done at the opticallevel on the dynamics of starch during the ovular development in barley.