This paper introduces the functions and popularizing situation of the mine switch lock with two precautions,and advances some suggestions on popularizing the mine switch lock with two precautions.是什么意思_This paper introduces the functions and popularizing situation of the mine switch lock with two precautions,and advances some suggestions on popularizing the mine switch lock with two precautions.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句