pivotal

US /ˈpɪv.ə.t̬əl/
UK /ˈpɪv.ə.t̬əl/
"pivotal" picture
1.

关键的, 枢纽的, 重要的

of crucial importance in relation to the development or success of something else

:
The discovery of penicillin was a pivotal moment in medicine.
青霉素的发现是医学上的一个关键时刻。
Her role in the project was absolutely pivotal.
她在项目中的作用绝对是关键的。