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[ˌindiˈspensəbl]

adj. 不可缺少的,必不可少的  

拆分: in-不,无,非dis-分开 + -pens-称量 + -ible形容词词尾可分开称量的,不可进行分配的可分发的,不可乱发的重要的       

例:
This book is indispensable to anyone interested in space exploration.
Mobile phones have become an indispensable part of our lives.