中文的没看到有什么人去解释，大致翻下查到的英语的。For interoperability, 802.11n supports three modes, explains Hung: 对于兼容性，802.11n支持三种模式： * Legacy mode. 延伸模式Addresses 11n APs and an 11a/g/b client environment. In this case, the client decodes the first three fields of a six-field header, which is specific to 11a and 11g. If
