不可或缺 bùkě-huòquē necessary
necessary; must have
How to remember 不可或缺: 不 not + 可 may + 或 or + 缺 lack = necessary.
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How it is used
- 'Indispensable, cannot do without' - 水是生命中不可或缺的 (shuǐ shì shēngmìng zhōng bùkě-huòquē de) water is indispensable to life.
- Formal (或 = 'even slightly'); stronger and more written than plain 必要.