RULER 统治者, a man who rules a country because he is from a royal family

国王;

Henry VIII, King of England

英格兰国王亨利八世

On 2 December Henry VI was crowned king (=made the king at an official ceremony) .

十二月二日，亨利六世加冕为国王。

THE BEST 最佳者, the king of sth someone or something that people think is the most important or best of a particular type of person or thing

某物之王; 某物中的极品:

the King of Rock 'n' Roll

摇滚乐之王

the king of Swiss cheeses

瑞士奶酪中的极品

The lion is the king of the jungle .

狮子是丛林之王。

SUCCESSFUL 成功的, if you live like a king, feel like a king etc, you are very successful, happy, rich etc

极佳的感觉〔指极其成功、幸福、富有等〕:

With her at my side, I felt like a king.

有她在我身边，我感到非常幸福。

CHESS 国际象棋, the most important piece in CHESS

王〔国际象棋中最重要的棋子〕

IMPORTANT 重要的, be king if something is king at a particular time, it has a big influence on people

极具影响:

back in the days when jazz was king

在往昔爵士乐极为盛行的年代

a king's ransom, a very large amount of money

一笔巨款