门闩类的东西bar

至关重要的部分和因素;最关紧要的key

• 胜利的关键

  key to victory

• 抓住问题的关键

  grasp the crux of the matter

• 这是革命成败的关键。

  This is the key to the success or failure of the revolution.

• 这是解决问题的关键。

  This is the key to solving the problem.

• 夺取胜利的关键时刻

  key moment in securing victory