Definition
To have control or influence over something; to be the decisive factor.
掌控，掌握关键
In this negotiation, he holds the key because he has to approve the final agreement.
在这场谈判中，他掌握着关键，因为他必须批准最终协议。
Because they have the exclusive technology, they hold the key position in the market.
因为他们拥有独家技术，所以他们在市场上占据了关键地位。
The new coach holds the key to whether the team can be successful.
新教练掌握着球队能否成功的关键。