essential to

• 对 ... 是必不可少的

essential to的用法和样例：

例句

1. Air is essential to life.
   生命不能缺少空气。
2. Food, water and air are essential to life/for the preservation of life.
   食物、水和空气对(维持)生命是必不可少的。
3. Is money essential to happiness?
   金钱对於幸福是必不可少的吗?
4. Food is essential to life.
   食物对生命是必不可少的。