The contents, subject matter and application of the concept are in constant change and development to adapt to evolving international politics. Accordingly, its crux shifts.

• 它的内容、主体和适用范围始终在不断适应国际政治的变化和发展,它的重心也必将随着其内容、主体和适用范围的发展变化而发生相应的转移。