B1 needed in order to achieve a particular result必需的,必不可少的
used in negatives and questions to show that you disapprove of something and do not think it should be used or done(用于否定句和疑问句表示不赞同)必要的,应该的
More examples
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.
We can always go back to the original plan if necessary.
No purchase is necessary for you to enter this competition.
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