首先，您需要添加新标志，用于代表目录服务器选项的参数。

First, you need to introduce the new flags for the argument that will be used to represent the catalog server option.

youdao

主规格：每个目录有一个主规格，它代表这个目录中所有产品共有的属性。

Primary specification: Each catalog has a primary specification representing the set of Shared attributes for all products in the catalog.

youdao

如果能够将信息分放到代表三种类型的不同目录中，分组转换就更容易了。

If you can divide your information into directories to represent the three types, it's easier to convert each as a group.

youdao

hi3 Whereas Hi3, I just created, it happens to live in this directory but my computer doesn't know that so you do dot slash which says current directory.

至于我刚刚创建的,它正好位于我电脑不知道的位置,所以你必须敲入，/，这代表当前目录。

哈佛公开课 - 计算机科学课程节选

In parenthesis now is a tilde which is shorthand notation for My Home Directory.

在圆括号里的,代表根目录。

哈佛公开课 - 计算机科学课程节选

Dot is my current directory, slash means Hi3 is located here.

代表我当前目录，/表明hi3位于此处。

哈佛公开课 - 计算机科学课程节选