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.

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如今， 科学家已经掌握了把某些化学物质撒在云层上以人工 造 雨的方法。

Now scientists have learned to make rain by salting clouds with certain chemicals.

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