X out all of the multiples of 2, except 2 itself.

X 出所有 2 的倍数，除了 2 本身。

A few astronomers continue to think there may be a Planet X out there a real whopper, perhaps as much as ten times the size of Jupiter, but so far out as to be invisible to us.

现在，有的天文学家继续认为，冥王星之外也许还有行星X一颗真正的庞然大物，也许有木星的10倍之大，只是它太遥远，我们看不见。