be essential to

• Eg : food is essential to life ( for the preservation of life )
  食物对生命（对维持生命）是绝对必要的。
• It is essential to the triumph of reform that it should never succeed
  改革胜利的要素是它永远不得成功
• Hard work is essential to success
  努力工作是成功的基础
• In order to understand wicca it is essential to know its roots
  为了理解巫术崇拜的本质就要知晓它的根源。
• I need to buy some sugar and salt ; those are essential to the taste
  我要买些糖和盐；它们是调味的要素。
• Food is essential to life
  食物是维持生命不可或缺的。
• Is essential to humankind s survival
  是人类生存之根本
• This is not easy ; but it is essential to your effectiveness
  这并不容易，但对提高你的工作效率有重大意义。
• Both are essential to life
  两者都是生命中必经之途。
• It is essential to ask and obtain a few sample files as well
  基本上还要要求（或者取得）其他一些示例文件。