关键的

• pivotal
• key
• crucial
• critical

例句

1. 即使你不同意我的观点，你也不要在这关键的时候闹乱子。
   Even if you don't agree with me, you mustn't rock the boat at this critical time.
2. 决定性关头，关键时刻决定性或关键的时刻或状况
   A decisive or critical moment or situation.
3. 谈判正处于一个关键的阶段。
   Negotiations were at a crucial stage.