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.是什么意思_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.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句