Returns a string representation of the null device.
返回一个空的设备，以字符串的形式。
You will need the device for which you are writing the driver and a null-modem (serial) cable for remote debugging.
需要有一个正在为其开发驱动程序的设备，以及一根串口线来进行远程调试。
File descriptors 0, 1, and 2 are open to /dev/null (Solaris makes heavy use of symlinks, which is why the pseudo device is shown).
文件描述符0、1和2 分配给了 /dev/null（Solaris大量使用符号链接，所以这里显示了相应的伪设备）。
It is important that you use a null modem cable; if you use a typical serial cable, the target computer expects a serial device and not another serial port, and you cannot debug the computer.
有一点很重要，那就是要使用零调制解调器电缆，如果您使用普通的串行电缆，目标计算机则期望与串行设备通信，而不是与另一个串行端口通信，这样您就无法调试该计算机。
The signal generator null sensitivity affects the accuracy and resolution of measurement because the gyro is an integrating device.
因为陀螺是一种积分装置，所以信号发生器的零位灵敏度影响测量精度和测量分辨度。
If getDefaultAdapter() returns null, then the device does not support Bluetooth and your story ends here.
如果 BluetoothAdapter返回为null，那么设备不支持蓝牙而你的故事将在此结束。
If getDefaultAdapter() returns null, then the device does not support Bluetooth and your story ends here.
如果 BluetoothAdapter返回为null，那么设备不支持蓝牙而你的故事将在此结束。
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