Various forms of regional and sub-regional multilateral cooperation are constantly being developed,and security dialogues and cooperation are being carried out at many levels and through many channels.是什么意思_Various forms of regional and sub-regional multilateral cooperation are constantly being developed,and security dialogues and cooperation are being carried out at many levels and through many channels.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句