Subtype must be substitutable for their base types.
子类型必须能够替代他们的基本类型。
Subtypes must be substitutable for their base types.
派生类型必须可以替换它的基类型。
Subclasses should be substitutable for their base classes.
子类应该可以替换其基类。
Derived types must be completely substitutable for their base types.
派生类型必须是它们的基础类型完全可替换的。
Derived types must be completely substitutable for their base types.
派生类型必须是它们的基础类型完全可替换的。
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