You can extend the Book type to create a BookSales type using the extension base keyword.

可以通过使用 extension base 关键字扩展 Book 类型以创建 BookSales 类型。

youdao

The types Origin and Destination mimic the design I originally outlined in my UML diagram when I use extension base="Address" to show that they inherit the characteristics of Address.

类型 Origin 和 Destination 模仿了我最初在 UML 图中所勾画的设计，这里我使用 extension base="Address" 来表明它们继承了 Address 的特征。

youdao

To most people, such a home base, in the literal sense, needs more than one person for sustenance and in generational extension.

对大多数人来说，这样一个家庭基础，就其字面意义而言，需要不止一个人来维持和世代延续。

youdao

James Puxty, of the NEC Group whose base is next to the airport, said the runway extension was "really positive news" for the company.

BBC: Birmingham Airport runway extension work starts

Meeting schedules and building on this sales base is critical if the company (and, by extension Japan) is going to be a player in the small scale passenger jet industry.

FORBES: Connect