indispensable

释义

n. 不可缺少之物\na. 不可缺少的, 责无旁贷的, 绝对必要的

例句

To be without some of the things you wan is an indispensable part of happiness.

你追求不到的东西有时也是幸福不可缺少的一部分。

This is an indispensable organization, but an organization that can only work because of the staff and their contribution and your dedication.

联合国是一个必不可少的组织，但也是一个全因有了其全体职员的贡献及他们的奉献才能运作的组织。