This article analyzes the forming reason of Overhead Contact System (OCS) hard point of electrified railway and describes the importance and necessity to amend hard point.是什么意思_This article analyzes the forming reason of Overhead Contact System (OCS) hard point of electrified railway and describes the importance and necessity to amend hard point.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句