铅锤plumb
铅垂线geographic vertical【测】;plumb line【测】;vertical line【测】
铅锤plumb bob
绝对垂线偏差absolute deflection of vertical【测】;absolute plumb line deflection【测】;
定位铅锤posting plumb【林】
铅锤线plumb line
垂规plumb rule
垂直线perpendicular line【数】;plumb【数】;vertical line【数】