• 1. 不定问题: indeterminate problem
• 2. 不可判定问题: undecidable problem
• 3. 不确定性问题: Uncertain Problems

• 1.该问题属不定问题，即根据探头测量的微小磁场所建立的方程组求得的未知脑磁源有无穷组解。
  This question belongs to the indeterminate problem, that is, infinite solutions can be obtained from the equations of the measured small magnetic fields on the detector.
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• 2.直面困难——比较严重的问题往往会被忽视，因为人们感觉搞不定它们。
  Introduce the Elephant - Big problems are often ignored because people perceive them to be insurmountable.
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• 3.尽管中日双边贸易强劲增长，但受领土争端和历史问题的困扰，两国关系摇摆不定。
  Despite booming bilateral trade, the relationship has regularly been shaken by disputes over territorial and historical issues.
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