characteristic ash curve

例句：

1. 1.The characteristic ash curve of the volcano is visible from a distance.
   火山的灰曲线从远处就能看到。
2. 2. The characteristic ash curve of the volcano is used to predict future eruptions.
   火山的灰曲线被用来预测未来的喷发。
3. 3.The characteristic ash curve of the volcano is an important tool for geologists.
   火山的灰曲线是地质学家的重要工具。