Plot the altitude of the crossroads and other significant sites of the northern plateau with no other instrument but our stone mason's level. 在除了石制水平儀之外，沒(méi)有其他儀器的情況下，測量出十字路口以及北部高原重要地點(diǎn)的海拔高度。
A surveying instrument consisting of a spirit level and a sighting tube,used to measure the angle of inclination of a line from the observer to the target. 由一個(gè)水平儀和一個(gè)觀(guān)測管組成的測量工具，用來(lái)測量從觀(guān)測者到目標的直線(xiàn)的傾斜角。
