天文学家们首次发现它时是在寻找介于这两大行星间的另一个行星。

Astronomers first spotted it when looking for a new planet they thought should exist between these two.

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行星对人类的作用以不同的形式表现出来，受其黄道带位置及其与其他行星间的关系的影响。

These planetary forces take on different forms, depending on their zodiacal positions and on the way they relate to one another.

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不同类别行星间的区别已经被模糊淡化，因此目前太阳系包含三种类型的行星，而不是先前的两种类型。

The distinction between different types of planethas already been broadened so that the solar system is now thought to containthree, rather than two, types.

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