Level 5 is similar to level 4, but intends to provide service continuity with no impact on end-user service perception of IMS functionalities.是什么意思_Level 5 is similar to level 4, but intends to provide service continuity with no impact on end-user service perception of IMS functionalities.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句