For laying in,in tunnels and in cable trench, unable to bear external mechanical forces. Single core cable in magnetic duct is not permissible.是什么意思_For laying in,in tunnels and in cable trench, unable to bear external mechanical forces. Single core cable in magnetic duct is not permissible.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句