这允许把用户内存分割为更多的段。

This allows more segmentation of user memory.

youdao

dxfer_len：数据传输的用户内存的长度。

Dxfer_len: the length of the user memory for data transfer.

youdao

现在，让我们来研究一下用户操作用户内存的内核api。

Now, let's explore the kernel APIs for manipulating user memory.

youdao

Its name is malloc for memory allocation and what malloc does for us is we say, hmm, the user has typed in a three-letter word.

它为我们分配内存地址,它为用户输入的3个字母单词,分配地址。

哈佛公开课 - 计算机科学课程节选

That is the address in memory in the heap of the first byte that the user typed in.

那是用户输入的字符串第一个字节,内存中堆的地址。

哈佛公开课 - 计算机科学课程节选

Let's assume that the user typed in a pretty short word we didn't run out of memory or anything crazy so here's the new feature.

假设用户输入,很短的单词，没有出现超出内存之类的问题,这里是新的特点。

哈佛公开课 - 计算机科学课程节选