这必不可少，她说。

It's obligatory, she said.

youdao

如果你原来计划用一个非常昂贵的背景，请再仔细想想看是否这昂贵的背景对于言语和视觉的幽默来说真的是必不可少的吗？

If your original draft of the material utilizes a pricey backdrop, look carefully at whether the backdrop is really essential to the delivery of the verbal or visual humor.

youdao

至于巴勒斯坦人的团结，这实际上对任何切实可行的解决方案都是必不可少的。

As for Palestinian unity, it is indeed essential for any viable settlement.

youdao

We're going to get a deep insight if it's a necessary truth about death that everyone dies alone.

如果这是对死亡来说必不可少的真理,那我们能得到一些深刻理解。

耶鲁公开课 - 死亡课程节选

This is an essential part of the critique of structuralism.

这是结构主义评论的必不可少的一部分。

耶鲁公开课 - 文学理论导论课程节选