Now all you have to do is create a TLD (tag Library Descriptor) file to register your custom tag, as shown in Listing 4.

现在要做的全部工作就是创建一个TLD(标记库描述符)文件，以登记定制标记，如清单4所示。

youdao

The first thing we need to do is write the tag handler class.

我们要做的第一件事是编写标记处理程序类。

youdao

The first thing to do is tag the bug-fixed code.

首先要做的是给修复 bug 之后的代码加上版本标记。

youdao

What we need to do is get rid of the Coulomb tag that we have - that's how we measure our electron charges - charge, and so we use this epsilon nought quite often, this permativity constant of a vacuum to make that conversion.

怎么量度电子电荷,所以我们会经常用到,这个epsilon，nought记号,这是真空中的介电常数,我们还要指出,这个介电常数。

麻省理工公开课 - 化学原理课程节选