If you hesitate before moving or neglect to move promptly, your mem will be wiped off by time.

如果你在行动前犹豫不决，或者不及行动，你的记忆信息就会被去。

But this descriptor length here is used down below in that mem copy.

但是这里的长度在下面的内存副本中使用。

That means we can copy more than two bytes using this mem copy function.

这意味着我们可以使用此内存复制功能复制两个以上的字节。

We don't have to jump back into the code that called the mem copy.

我们不必跳回调用内存副本的代码。

We control mem copies return pointer, and we capture the flow of control profit.

我们控制mem拷贝return指针，我们捕获控制利润的流。

So what does the copy operation look like? If we do the mem copy, it looks like this.

那么复制操作是什么样子的呢？如果我们进行 mem 复制，它看起来像这样。

So we take a bunch of our payload, copy it over the stack, and then the mem copy is done.

所以我们拿了一堆我们的有效载荷，把它复制到堆栈上，然后内存复制就完成了。

We mem copy that descriptor with that length that we set to two here and this descriptor into that DMA buffer.

我们用我们在这里设置为 2 的那个长度复制那个，并将这个复制到那个 DMA 缓冲区中。

The mem copy would return to this function because of the saved return points around the stack, which we overwrote.

由于我们覆盖了堆栈周围保存的返回点，内存副本将返回到此函数。

One thing to note is that sometimes MEMS oscillators are used in smartphones to  save space instead of crystal oscillators, and we'll dive into MEMS in a future episode.

需要注意的一点是， 有智能手机中使用 MEMS 振荡器来代替晶体振荡器以节省空，我们将在未来的章节中深入探讨 MEMS。

And the interesting thing is on the stack, the stack in the C language is used if you do a function call to the mem copy, for example.

有趣的是在堆栈上，例如，如果您对 mem 副本进行函数调用，则使用 C 语言中的堆栈。

These technologies are the speaker, audio codecs, Bluetooth, the System on a Chip or SoC, the Printed Circuit board or PCB, accelerometers, the Lithium Ion Battery, MEMS microphones, and noise cancellation.

这些技术包括扬声器、音频编解码器、蓝牙、片上系统或 SoC、印刷电路板或 PCB、加速度计、锂离子电池、MEMS 麦克风和噪音消除技术。

I didn't have enough money and then the checkout lady insisted on counting every single coin and the people behind mem were getting really annoyed and it was so embarrassing.

我没有足够的钱，然后收银员坚持要清点每一枚硬币，mem 背后的人真的很生气，这太尴尬了。

But what if we copy eight kilobytes? If we set that w length to eight kilobytes, then the mem copy operation is going to copy that variable plus 8,190 bytes into that DMA buffer from the stack.

但是如果我们复制 8 KB 呢？如果我们将 w 长度设置为 8 KB，那么内存复制操作将把该变加上 8,190 字节从堆栈复制到 DMA 缓冲区中。

And what then happens is that down below here, a mem copy happens where that response, this is the response that the host waits for on that control request because it wants to get the status.

然后发生的是，在下面的下方，一个内存副本发生在该响应的位置，这是主机等待该控制请求的响应，因为它想要获得状态。