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 .
weighty
[形容词]
having considerable importance, influence, or gravity

重要的, 显著的
Ex: The award ceremony celebrated individuals who had weighty contributions to the advancement of science and technology .
focal
[形容词]
having significant or central importance

核心的, 重要的
Ex: focal objective of the marketing campaign was to increase brand awareness among millennials .
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 .
seminal
[形容词]
having a strong influence on future developments, ideas, or work
Ex: The book was seminal work in modern philosophy .
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
Ex: The military strategy regarded the frontline troops expendable in order to achieve the mission 's objectives .

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