After its invention, it became an almost indispensable part of most households within the space of just a few years.

它在被发明后的短短几年时间里几乎成为了大多数家庭不可或缺的一部分。

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The quality of independence is so indispensable for us that parents had better act as a tutor, not a director.

独立的品质对我们来说是如此的不可或缺，父母最好是一个导师，而不是一个指导者。

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A good dictionary is indispensable for learning a foreign language.

一本好词典是学习外语必备的。

《牛津词典》

"And also, I react to this as a journalist -- an interchange of information and ideas between government and the news media is indispensable to a functioning democracy, and if you start scaring sources with the possibility of years in prison, the loser is not going to be the news media -- it's going to be the public, " he said.

CNN: Toobin: Obama has been 'very tough' on leakers

Quick, granular feedback from customers is indispensable to a company, which is why we originally developed the Net Promoter system.

FORBES: The Root Cause Of Your Customer's Anger

And Chuck recognizes that American leadership is indispensable in a dangerous world.

WHITEHOUSE: The White House