使用140个字符进行通信似乎并不是使Twitter广受欢迎一条创意。
Communicating at 140 characters didn't seem like an idea that would be popular.
另一个问题时潜艇在水下时用低频进行通信，因为低频可以穿透海水传播，但用低频通信时，通信速度只能每秒几个字符。
The other problem is that submarines receive messages using low-frequency radio waves that can penetrate water, but only a few characters per second can be transmitted at these frequencies.
UR l字符串由于通信协议的不同而不同，下面的清单1到清单5演示了这一点。
The URL string varies depending on the communication protocol, as Listings 1 through 5 below demonstrate.
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