bi-frequency system是什么意思 bi-frequency system在线中文翻译

bi-frequency system是什么意思，bi-frequency system在线翻译，bi-frequency system中文意思，bi-frequency system的中文翻译，bi-frequency system发音，bi-frequency system例句，bi-frequency system词组短语，bi-frequency system怎么翻译，单词bi-frequency system的意思