n.人工降雨
Local meteorological authorities urged artificial rainmaking efforts to increase soil moisture. 當(dāng)?shù)貧庀缶志o急實(shí)施人工降雨，從而提高土地濕度。
Artificial rainmaking is practised in many countries but its success is hard to prove. 許多國(guó)家都開(kāi)展了人工降雨，但難以證實(shí)其成功作用。
