These observations suggest that in some areas where the rattlesnakes are abundant, local squirrel populations have evolved a degree of resistance.

这些观察说明，在响尾蛇分布广泛的地区，当地松鼠会进化出一定程度的抗性。

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This theory seemed to agree with observations taken over the last three decades, which reveal that binary systems are abundant, but none of the pairs have an orbital period shorter than five hours, the researchers said.

MSN: 'Impossible' stars found in our galaxy - Technology & science - Space - Space.com | NBC News