If you want to stop your oxygen, just push down the locking ring at the outlet, then pull out the cannula and keep it clean before next use.是什么意思_If you want to stop your oxygen, just push down the locking ring at the outlet, then pull out the cannula and keep it clean before next use.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句