essential

Regular exercise and a balanced diet are essential for maintaining good health.

(Chinese) 定期锻炼和均衡饮食对保持健康至关重要。

Water is an essential ingredient for all life forms on this planet.

(Chinese) 水是地球上所有生命形式必不可少的元素。

The essential difference between the two products is the material used in production.

(Chinese) 这两件产品之间的本质区别在于生产所用的材料。

There is no essential conflict between economic growth and environmental protection.

(Chinese) 经济增长与环境保护之间没有本质冲突。