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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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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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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The reason is uncertain, but the most likely explanation is that more of its larvae than normal are reaching adulthood.

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The reason is that the rules for successful investing do not change just because the environment has become more uncertain.

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