0 needed in order to achieve a particular result -- 必需的，不可或缺的
I don't have much time so I won't be staying any longer than necessary. 我時間不多，所以若非必要我不會逗留。
Just do what's necessary and then leave. 做完必要的事情就走吧。
If necessary, we can always change the dates of our trip. 必要的話，我們隨時可以改變旅行的日期。
Is it necessary for all of us to be present at the meeting this afternoon? 我們必須全體出席今天下午的會議嗎？
We don't want to take any more luggage with us than is strictly necessary. 除了不可或缺的行李以外，我們不想帶多餘的東西。
I don't think that kind of language is necessary in a show that kids could be watching. 我真的認為在電視上使用那種語言是不可取的。
Was it really necessary for you to say that? 你非要那樣說嗎？
If you're going into teaching, energy is a necessary commodity.
Some alterations to our original plans might be necessary.
We shall do everything necessary to bring the murderer to justice.
No purchase is necessary for you to enter this competition.
Families were in poverty, he said, if their 'total earnings are insufficient to obtain the minimum necessaries for the maintenance of merely physical efficiency'.
Obviously if the whole of the surplus-value is consumed unproductively it makes little difference how it is consumed, either as necessaries or as luxuries.
Firstly wives alleged that during cohabitation their husbands removed necessaries from them or refused to supply cash or credit to purchase them.
