adj.预备的，初步的,先兆的
CONTINENTAL MANTLE METASOMATISM : A PRECURSORY EVENT OF PLATFORM ACTIVATION?
大陆地幔交代作用: 地台活化的先驱事件?
The shape and geometry of inclusion is an important factor which affects the precursory seismicity pattern.
包体的形状和几何位置是影响强震前兆地震活动图像形态的重要因素.
The anomalies of magnetic field and self - potential before earthquakes are important precursory phenomena.
震前电磁场和大地自电位的异常是重要的地震前兆现象.