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.
魯尼絕對是世界級的前鋒，他是曼聯的核心球員。
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.
這場高風險遊戯裡的核心玩家則是內矇古的包頭鋼鉄稀土(集團)高科技公司，它是世界上最大的稀土鑛生産商。
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.
許多科學家是研究酒癮和毒癮後，才了解多巴胺在形成習慣過程中的作用，但多巴胺在其他較普通行爲中，也是關鍵因素，象暴飲暴食。

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.