Water is essential for/to living things. 水對於生物來說是不可或缺的。
- 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.
essentialnoun [ C usually plural ]uk /ɪˈsen.ʃəl/ us /ɪˈsen.ʃəl/