By the end of 1990, the total area of fenced grassland had reached 183,000 hectares, while 161,000 hectares were under irrigation. Rats, pests and virulent plants have been kept under control over 1.187 million hectares of grassland.是什么意思_By the end of 1990, the total area of fenced grassland had reached 183,000 hectares, while 161,000 hectares were under irrigation. Rats, pests and virulent plants have been kept under control over 1.187 million hectares of grassland.在线翻译_英语_读音_用法_例句