• 1. Uncertain reason: 不确定原因
• 2. Jellyfish flood reason is uncertain: 水母泛滥原因尚无定论

• 1.Longer life spans are one reason, along with an increasingly uncertain financial picture.
  拥有更长的寿命是一个原因，与越来越不确定的金融前景也有关系。
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• 2.The reason for this is still uncertain, but it is obviously related to spatial ability.
  其中的原因还不明朗，但这显然和空间感有关。
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• 3.For example, a cancer may have in large lympho glands near to it, and it may be uncertain as to whether they are in large because of cancer or for another reason.
  例如，恶性肿瘤周围会有大量的淋巴结，但它是否是由于恶性肿瘤造成的还是其他原因造成的很难确定。
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