• 1. 三大问题: three problems
• 2. 中国农村的三大问题: Modern Business Trade Industry
• 3. 希腊几何三大问题: three problems in Greek geometry

• 1.三大问题使土耳其的入盟抱负雪上加霜。
  Three things have made matters worse for Turkey’s EU aspirations.
  dict.yoduao.com
• 2.这种做法存在三大问题。
  There are three major problems with this approach.
  dict.yoduao.com
• 3.发热问题，被认为是电子工业面临的三大问题之一。
  It is considered to be one of the three essential problems of electronic industry.
  dict.yoduao.com

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