Planets of this intermediate size are common, but because the local solar system does not host one, they are also mysterious.
这种中间体积的行星很常见，但是因为本太阳系内没有，所以他们同样很神秘。
Planets of this intermediate size are common, but because the local solar system does not host one, they are also mysterious.
这种中间体积的行星很常见，但是因为本太阳系内没有，所以他们同样很神秘。
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