pivotal
[形容词]
playing a crucial role or serving as a key point of reference

关键的, 重要的
Ex: pivotal role of volunteers in disaster relief efforts is evident in their ability to provide immediate assistance to affected communities .
ascendant
[形容词]
holding the most power, importance, or influence

主导的, 上升的
Ex: As digital media continues to grow , its influence has ascendant over traditional print journalism .
expendable
[形容词]
easily replaced or sacrificed without significant loss or consequence, indicating a lack of value

可有可无的, 可替代的

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