Engineered for a long, lubrication-free service life, NIBCO NDA and NSR actuators combine O-rings and TFE seals to create a durable, low-friction seal.是什么意思_Engineered for a long, lubrication-free service life, NIBCO NDA and NSR actuators combine O-rings and TFE seals to create a durable, low-friction seal.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句