If someone or something is indispensable, they are so useful or important that you cannot manage without them. A tool, a worker, a phone, even a small habit can be called indispensable.

If someone or something is indispensable如果某人或某物是 indispensable, they are so useful or important that you cannot manage without them就是有用或重要到你少了他們就不行。A tool, a worker, a phone, even a small habit can be called indispensable一項工具、一個員工、一支手機，甚至一個小習慣都可以被說是 indispensable。

It is strong praise: you are saying the job or the day would fall apart if this went away. Though actually, people use it a little loosely — “this coffee is indispensable in the morning” is ordinary exaggeration, not a claim that you would be lost without it.

It is strong praise這是很強烈的稱讚: you are saying the job or the day would fall apart if this went away你是在說如果少了這個東西，這份工作或這一天就會垮掉。Though actually不過其實, people use it a little loosely大家用起來也會有點鬆散 — “this coffee is indispensable in the morning” is ordinary exaggeration像「this coffee is indispensable in the morning早上這杯咖啡不可或缺」只是一般的誇張說法, not a claim that you would be lost without it不是真的說沒有它你就活不下去。

In careful use it still means real trouble if it disappeared. Common in speech and writing; not stiff.

In careful use it still means real trouble if it disappeared嚴謹一點用的時候，它還是指這東西不見了會真的出大問題。Common in speech and writing這個字在口語和書面都很常見; not stiff不會顯得生硬。

There is a rare noun use for a person you cannot do without, but the safe pattern is the adjective: an indispensable person, an indispensable tool.

There is a rare noun use for a person you cannot do without雖然有個少見的名詞用法，指你少不了的那個人, but the safe pattern is the adjective不過安全的用法還是形容詞: an indispensable person像 an indispensable person不可或缺的人, an indispensable tool或 an indispensable tool不可或缺的工具。