EN
indispensable
Air is indispensable to life.
Air is indispensable to life.
It is imperative for you to act at once.
It is necessary for you to see a doctor at once.
The mandatory character of schooling is rarely analyzed in the multitude of works dedicated to the study of the various ways to develop within children the desire to learn.
I won't be able to go travelling until the requisite visa fees are paid.