打印机应答信号（ACK）：低电平有效，低电平表示打印机以处理完所接收的数据。打印机忙信号（BUSY）：低电平有效，若为高电平，意味着打印机正忙于处理刚收到的数据单片机切勿送来数据。
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我们也知道手机的数据链接速度在我们通过不同覆盖地区的时候会有所变化，如果无意间进入了“信号盲区”，那么克隆云在强大也帮不了忙。
The phone's data connection speed, as we all know, varies as you move through different coverage areas. If you stumble into a "dead" zone, there isn't much CloneCloud can do for you.
和灭信号检测才能的日害删强，中缓快跳频体解很等忙蒙到做扰的攻打。
With the development of signal detection technique, slow frequency-hopping systems are vulnerable to jamming attacks.
但当你经常这样做意味着一种强大的非语言信号：我在手机上忙的事情比你重要得多。
But do it too often and it sends a powerful non-verbal message to your S. O. : Whatever I'm doing on my phone is far more important than you.
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