1. Right now some problems that need urgent solution still exist in the economy.  
   当前，国民经济运行中还存在着一些亟待解决的问题。
2. To exist or continue in miserable or disheartening conditions. 
   憔悴存在于或继续处于悲惨或沮丧的境况中
3. The operation of determining if a condition that is supposed to exist does, in fact, exist. 
   确定一个设想的条件是否实际上存在的操作。
4. ionic diffusion in solution 
   溶液中离子的扩散
5. Preserving Specimens in Solution 
   浸制标本保护技术

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• 1. 存在于溶液中
  to exist in both tropical and subtropical zones 存在于热带和亚热带...to exist in solution 存在于溶液中...to fire an engine 启动发动机
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