It seemed to be a number code, where groups of numbers replace letters.

看起来用的是数字密码，用一组组数字代表字母。

One thing to practice is listening to groups of numbers.

要练习的一件事是听一组数字。

Now for multiplication, we're talking about groups of numbers.

现在对于乘法，我们讨论的是数字组。

For example, consider a group of numbers and a group of letters.

例如，考虑一组数字和一组字母。

You've got to get used to listening to large groups of numbers in sequence.

您必须习惯按顺序收听大量数字。

We can use a similar technique with our wall problem to eliminate entire groups of numbers at once.

我们可以对我们的墙问题使用类似的技术来一次消除整组数字。

" Mean" can also be a noun in mathematics or statistics to refer to the average of some group of numbers.

“均值”也可以是数学或统计学中的名词，指代某组数字的平均值。

" To average out" means to add a group of numbers and then divide by the number of items in the group.

“平均” 是指将一组数字相加， 然后除以该组中的项目数。

It seemed to be a number code，where groups of numbers replace letters. I worked on the words，because you can use a word as a key in a number code.

可以肯定，斯卡德尔用的是密码。对于密码我一直觉得很有兴趣；我喜欢游戏，数字这类的东西。看起来用的是数字密码，用一组组数字代表字母。我研究本上的文字，因为你可以利用文字作为解开数字密码的钥匙。