When using SSH to run commands across multiple machines without exchanging your public key, you need to type in your password for each machine.
如果不交换您的公钥，那么使用SSH在多台计算机中运行相应的命令时，您必须为每台计算机输入您的密码。
If you can decrypt the message using your public key, the server knows you are authorized to log in without a password.
如果您能使用您的公共密匙解密该消息，那么服务器就知道您被授权无需密码即可登录。
You may now upload files without storing your password in plain text and without being forced to enter it every time you connect to the remote server.
现在你可以在不将密码明文储存的情况下上载文件，也不必每次连接远程服务器的时候输入密码了。
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