Definition
To have control or influence over something; to be the decisive factor.
掌控，掌握關鍵
In this negotiation, he holds the key because he has to approve the final agreement.
在這場談判中，他掌握著關鍵，因為他必須批准最終協議。
Because they have the exclusive technology, they hold the key position in the market.
因為他們擁有獨家技術，所以他們在市場上佔據了關鍵地位。
The new coach holds the key to whether the team can be successful.
新教練掌握著球隊能否成功的關鍵。