Its gravitational field is on a density suddenchange belt of Bouguer anomaly isopleth.重力场则处于布伽重力异常等值线疏密突变带上....

isopleth的音标：isopleth的英式发音音标为：['aɪsəpleθ]isopleth的美式发音音标为：['aɪsəˌpleθ]...

n.等值线...