Required specifications (references) -set of interfaces used by a component's implementation.

被要求的规范(引用)——组件实现使用的接口集。

youdao

This instance doesn't have any special constructors, operations, attributes, or references, so these calls aren't required.

因为本实例没有任何特殊的构造函数、操作、属性或引用，所以不需要这些调用。

youdao

The service references specify required service specifications.

服务引用指定所需的服务规范。

youdao

Depending on the type of voluntary role you get involved with, you may be required to provide two references and fill in some forms.

BBC: Children in the back of a car

That FTC settlement required Antares to provide five references in my county of residence.

FORBES: Check it out.com