1.  essential
2.  necessary
3.  indispensable

• 1. 必备: Necessary | Mandatory | essential | bag
• 2. 尚春秋必备: D I O HOMME
• 3. 必备树: Prerequisite Tree | PrT

更多释义

• 1.一本好词典是学习外语必备的。
  A good dictionary is indispensable for learning a foreign language.
  dict.yoduao.com
• 2.学位是做这级工作必备的先决条件。
  A degree is an essential prerequisite for employment at this level.
  dict.yoduao.com
• 3.教学经验是担任这项工作的必备条件。
  Previous teaching experience is a necessary qualification for this job.
  dict.yoduao.com

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