1. 必不可少的;不可或缺的
If you say that someone or something is indispensable, you mean that they are absolutely essential and other people or things cannot function without them.
e.g. She was becoming indispensable to him.
他已变得越来越离不开她了。
e.g. ...the indispensable guide for any traveller in France.
在法国对任何游客来说都不可缺少的向导