About 6.70 million ha of rice fields can be used for fish breeding, but the utilization rate at present is only 15 percent.是什么意思_About 6.70 million ha of rice fields can be used for fish breeding, but the utilization rate at present is only 15 percent.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句