这要花一段时间，但这些广播机构无需昂贵的服务器群组或大容量数据管道，就能将大型媒体文件发送给世界各地的观众。
It takes a while, but the broadcaster does not need expensive server farms or fat data pipes to deliver massive files to viewers anywhere in the world.
通过在粗同轴电缆中以广播方式发送数据包，以太网把网线布线当作广播用的“光以太”。
Ethernet used its cabling as radio "ether" by simply broadcasting packets over a thick coaxial line.
不同广播是，多播仅仅发送给那些明确地登记的而且对数据的兴趣的地址。
Unlike broadcasting, multicasting only forwards to those addresses who have explicitly registered interest in the data.
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