key player

基本解释

"Rooney is one of the best strikers in the world," said Mascherano. "He is a key player for them.
鲁尼绝对是世界级的前锋，他是曼联的核心球员。
The key player in this high-stakes game is Baotou Steel Rare Earth (Group) Hi-tech Co., from Inner Mongolia - the world's largest producer of rare earth elements.
这场高风险游戏里的核心玩家则是内蒙古的包头钢铁稀土(集团)高科技公司，它是世界上最大的稀土矿生产商。
Much of what scientists know about dopamine’s role in habit formation comes from the study of alcohol and drug addiction, but it is a key player in more common habits, too, like overeating.
许多科学家是研究酒瘾和毒瘾后，才了解多巴胺在形成习惯过程中的作用，但多巴胺在其他较普通行为中，也是关键因素，象暴饮暴食。

A key player in any coalition building is likely to be Kurdish parties.
But Hollis says Iranian conspiracy theories have always seen Britain as the key supporting player, or even as the grand covert manipulator.
In nearby Saudi Arabia, which is an important player as well as a key moral force in the Arab and Islamic world, there appeared to be a quiet sense of enjoyment over the news.

Veltri was a key player in a study of the cholesterol drug Vytorin called ENHANCE.
FORBES: The Great Drug Debate

The key players in a particular organization, event, or situation are the most important people or things involved in it.