18世纪20年代，军事飞行员驾驶着载满带电沙粒的飞机去袭击云层，尝试人工造雨并且清除雾层。
In the 1920s airplanes loaded with electrified sand were piloted by military aviators who "attacked" the clouds in futile attempts to both make rain and clear fog.
进行此类研究的实际原因在于火山灰带电性将对飞机无线电通讯造成干扰。
The practical reason for understanding the electrical nature of ash plumes is that they can interfere with aircraft radio communication.
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