rough lead method

例句：

1. 1. The engineer usedthe rough lead method to estimate the distancebetween two points on the map.
   工程师使用粗略铅法来估计地图上两点之间的距离。
2. 2.The rough lead method is a useful toolfor quickly determining the location of an objectin space.
   粗略铅法是一种快速确定物体在空间位置的有用工具。
3. 3. In thisexperiment, we applied the rough lead methodto measure the density of different materials.
   在这个实验中，我们应用了粗略铅法来测量不同材料的密度。