Described as the Standard V90 of ITU_T, the transfer speeds of the two ends are different, that of download is up to 56kbit/s.是什么意思_Described as the Standard V90 of ITU_T, the transfer speeds of the two ends are different, that of download is up to 56kbit/s.在線翻譯_英語_讀音_用法_例句