A substance, such as dried clay or cement, used to pack and seal pipe joints and other connections or coat a porous surface in order to make it tight.是什么意思_A substance, such as dried clay or cement, used to pack and seal pipe joints and other connections or coat a porous surface in order to make it tight.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句