indispensable /ˌɪndɪˈspɛnsəbəl/ adjective /ˌɪndɪˈspɛnsəbəl/
adjective
Learner's definition of INDISPENSABLE
[more indispensable; most indispensable]
: extremely important and necessary不可或缺的;必需的 —
often + for or to — indispensability
/ˌɪndɪˌspɛnsəˈbɪləti/ noun [noncount]