If you leave all ports open, you're leaving a lot of options for a cracker who wants to break into your network.
如果你离开所有的端口开启，你正在为一个想要闯入你的网络的破坏者留下许多选择项。
The simplest form of a TCP port scan is to open a connection to all ports on a host.
TCP端口扫描的最简单形式是打开一个到主机所有端口的连接。
All gun-ports were open and the muzzles peeped wickedly from them.
船上的炮眼都开着，炮口虎视眈眈地向外窥视着。
By connecting coax cables to all four output ports as shown, an open-circuit calibration can be performed.
如图所示，通过将同轴电缆连接之所有的4个输出端口，则可进行开路校准。
By connecting coax cables to all four output ports as shown, an open-circuit calibration can be performed.
如图所示，通过将同轴电缆连接之所有的4个输出端口，则可进行开路校准。
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