用第一个呀，小写就行。
第二个是公司名，大写；
第三个是特定物种里个头最大最强的那类群体的前缀，
king penguin、king salmon 这类；

也有 railroad king、monkey king 的说法，
前者用于说明人，不是 railroad、
后者用于描述某只猴，不是一个特定种群，
甚至可能是指猴子保护领域里成就很高的那个人，
如果是我就用第一个说法

<--- Collins Cobuild English Dictionary --->
king
king  kings

1. A king is a man who is the most important member of the royal family of his country, and who is considered to be the Head of State of that country.
...the king and queen of Spain...
In 1154, Henry II became King of England.
  N-TITLE; N-COUNT: oft the N of n

2. If you describe a man as the king of something, you mean that he is the most important person doing that thing or he is the best at doing it.
He's the king of unlicensed boxing...
  N-COUNT: the N of n

3. A king is a playing card with a picture of a king on it.
...the king of diamonds.
  N-COUNT: oft N of n

4. In chess, the king is the most important piece. When you are in a position to capture your opponent's king, you win the game.
  N-COUNT


<--- Oxford Advanced Learner's Dictionary --->
king
noun

  1  the male ruler of an independent state that has a royal family:
the kings and queens of England * to become / be crowned king * King George V

  2  ~ (of sth) a person, an animal or a thing that is thought to be the best or most important of a particular type:
the king of comedy * The lion is the king of the jungle.

  3  used in compounds with the names of animals or plants to describe a very large type of the thing mentioned:
a king penguin

  4  the most important piece used in the game of CHESS, that can move one square in any direction

  5  a playing card with the picture of a king on it

【 在 jackalove (jackalove) 的大作中提到: 】
: 所以三种都行？
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FROM 117.136.0.*