And that concept is really to either write information into the brain and the nerve system or read information out of the brain and the nerve system.

这一概念实际上是指,向大脑或者神经系统输入信息,或者读出大脑和神经系统以外的信息。

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And so, we can immediately write this du and then we can write du for the universe, which is system plus surroundings is equal to zero.

因此，我们可以立刻写出这个等式,然后可以写出总的的，也就是系统加环境的du，等于零。

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