Objective-C only supports single inheritance between classes, while UML supports multiple inheritances.

Objective - C只支持类之间的单一继承，而UML支持多重继承。

youdao

In Vimscript, as in c, only the numeric value zero is false in a Boolean context; any non-zero numeric value-whether positive or negative-is considered true.

和c一样，在Vimscript中，对于布尔值来说，只有数值0为假；任何非0数值—不管是正数还是负数—都为真。

youdao

Manually initialize non-member objects of built-in types, because C++ only sometimes initializes them itself.

（手动初始化内置类型的非成员对象，因为C++只偶尔会初始化它们）。

youdao

Manually initialize non-member objects of built-in types, because C++ only sometimes initializes them itself.

（手动初始化内置类型的非成员对象，因为C++只偶尔会初始化它们）。

youdao