无论如何，有一种聚变燃料的选择不是那么罕见的。

However, one fusion fuel option isn't so exotic.

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如此澄澈的天空并不是那么罕见，来自北方的冷前锋后面一般都有晴朗的天空。

'These clear skies aren't that infrequent, it's not an uncommon situation to have a cold front coming down from the north with clear skies moving behind.'

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但这些科学家也提出了一种更加让人不安的解释：传染性癌症可能并不那么罕见。

But the scientists also proposed a more disturbing explanation: that the emergence of contagious cancer may not be so rare after all.

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