The design concept of the automatic security shutoff is a hinged door closing onto a knife-edged seat fully contained in a high-grade ductile iron body (or steel casting).是什么意思_The design concept of the automatic security shutoff is a hinged door closing onto a knife-edged seat fully contained in a high-grade ductile iron body (or steel casting).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句