gǔ / dài / dì / tú / huì / zhì / zhě / cháng / yòng / sān / jiǎo / cè / liáng / fǎ / cè / liáng / shān / dì / de / jù / lí

古代地图绘制者常用三角测量法测量山地的距离。

Ancient mapmakers often used triangulation to measure distances in mountainous areas.