The resulting limit, given in units of bits per second, is the absolute maximum rate of error-free communication given signal strength and noise level.

在给定信号强度和噪声水平的情况下，以比特每秒为单位给出的最终限制是无差错通信的最大绝对速率。

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If we were to turn our back on Colombia by rejecting the free trade agreement, it would send a terrible signal to leaders willing to be courageous. It would send a bad signal to our friends.

如果我们背弃哥伦比亚，拒绝通过自由贸易协定，就会给那些本来勇敢无畏的领导人发出可怕的信号，给我们的盟友发出可怕的信号。

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With her free hand, Li managed to fumble it out, but there was no signal.

李万枝用另外一只手左摸右掏的总算把手机拿了出来，但是没有信号。

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While most people get Fox through a pay TV provider anyway, millions of other Americans rely on the free signal coming over their own antennas.

NPR: Exec Threatens To Pull Fox Signal If Aereo Goes On

As long as you have an HD-equipped radio (three million have been sold by Ibiquity, which is owned by big-league radio chains) you can listen to the digital signal free, without a subscription, and at the same frequencies, too.

FORBES: HD Radio: Is it the auto industry's next big thing?

Another market free-fall may not signal the end of the bad news.

FORBES: Another Leg Of The Credit Crunch Is Coming Soon