People thought of controlling precipitations in the 17th century. They used bell ringing and gunnery for the purpose of cloud shifting.
人们在17世纪就想过控制降雨，他们使用鸣钟和重炮改变云层的移动。
People thought of controlling precipitations in the 17th century. They used bell ringing and gunnery for the purpose of cloud shifting.
人们在17世纪就想过控制降雨，他们使用鸣钟和重炮改变云层的移动。
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