The peripheral seal cannot therefore be retained by the extension of the flange into the sulcus, but rather by the external aspects of the flange maintaining close contact with the tissues (Fig 3).是什么意思_The peripheral seal cannot therefore be retained by the extension of the flange into the sulcus, but rather by the external aspects of the flange maintaining close contact with the tissues (Fig 3).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句