Prime minister or president? 首相还是总统?

你的器材不支持播放多媒體材料

Every country has a head of state, or head of government. But not every country uses the same term of reference for its leader. The UK has a prime minister, the United States has a president, Germany has a chancellor, China has 國家主席 president 和國務院總理 premier.

So what does each of the above terms of address mean? What is the difference?

Neil and Li explain.