B1 necessary or needed必要的,必不可少的
More examples
The books on this list are essential reading for the course.
Fresh fruit and vegetables form an essential part of a healthy diet.
During the emergency, people stocked up on essential items like candles, medicines and tins of food.
It's essential that she has this medicine every day.
Computer literacy is becoming as essential as the ability to drive a car.
a basic thing that you cannot live without必需品;不可缺少的东西
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