Model-C design features, under the TFE seats at both ends of the valve, ensure no leakage around the back-side of the seats.是什么意思_Model-C design features, under the TFE seats at both ends of the valve, ensure no leakage around the back-side of the seats.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句