indispensable

adj

1. unavoidable

e.g. the routine but indispensable ceremonies of state

2. not to be dispensed with
essential

e.g. foods indispensable to good nutrition

3. absolutely necessary
vitally necessary

e.g. essential tools and materials
funds essential to the completion of the project
an indispensable worker

Synonym: essential

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

1. 不可或缺：这时决定谁拥有游艇的所有权的关键因素在于1和2中谁拥有的专用型资产是不可或缺(Indispensable)的或不可替代的. 意即,如果厨师是市场上独一无二的,而船长市场是竞争性的,那么游艇的所有权就应该由厨师拥有,反之反是.