cloud seeding
noun [ U ] environment specialized uk/ˈklaʊd ˌsiː.dɪŋ/ us/ˈklaʊd ˌsiː.dɪŋ/
（为进行人工降雨而作的）云的催化，云种散播
the act of spreading substances such as certain chemicals in clouds, in order to try to make them produce rain, or more rain
Some officials said cloud seeding has increased rainfall perhaps by 10 percent. 一些官员说，云种散播可能增加了10% 的降雨量。
- More examples
- Many researchers remain unconvinced that cloud seeding has been conclusively shown to produce a major boost in rainfall.
- Much of the effort centers on cloud seeding, in which ice crystals are added to clouds so that more moisture is released as rain.
- Cloud seeding and other forms of weather modification are being given serious consideration.
- For cloud seeding to be successful, clouds must contain supercooled water - water that has remained liquid at below-freezing temperatures.