The National tractor Research Institute,the National Bearing Research Institute,the Fourth Design and Research Institute of the National Machinery Committee aer in the city.是什么意思_The National tractor Research Institute,the National Bearing Research Institute,the Fourth Design and Research Institute of the National Machinery Committee aer in the city.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句