Base class sub-objects may have zero size.

基类子对象可以具有零大小。

youdao

Encodings for base class, sub-class, and programming interface are provided in Appendix D.

附录D提供了基类、子类和程序接口的具体编码。

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The year the oldest Ohio-class ballistic-missile sub completes its final nuclear patrol is now expected to be 2027, which sounds a long way off until you realize it takes nearly two decades to design, develop, build and test the lead ship in a successor class.

FORBES: The Submarine That Might Save America

To counter the glut of 2:1s, Mr Thomas recommends sub-dividing that class of degree even further, to recognise the "very good but not quite first-class" students.

BBC: NEWS | UK | Education | Degree grades 'in need of update'

And within this class I am specifically refering to the sub-category known as hustlers today.

FORBES: Entrepreneurs are the New Labor: Part I