This was known as passive mode, or PASV, after the command used by the client to tell the server it is in passive mode.
这就是所谓的被动模式，或者叫做PASV，当客户端通知服务器它处于被动模式时才启用。
The first port contacts the server on port 21, but instead of then issuing a PORT command and allowing the server to connect back to its data port, the client will issue the PASV command.
第一个端口连接服务器的21端口，与主动FTP模式中提交PORT命令并允许服务器来回连它的数据端口不同，客户端会提交PASV命令。
The first port contacts the server on port 21, but instead of then issuing a PORT command and allowing the server to connect back to its data port, the client will issue the PASV command.
第一个端口连接服务器的21端口，与主动FTP模式中提交PORT命令并允许服务器来回连它的数据端口不同，客户端会提交PASV命令。
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