而根据开普勒定律，随着距中心距离的增加环绕速度应该呈几何递减。
Outside the nucleus the rotational velocity would decrease geometrically with distance from the center, in conformity with Kepler's law.
为了寻找这些“丢失的物质”，我们研究了星系在据其环绕中心不同位置的环绕速度。
Our contribution to the search for this "missing matter" has been to study the rotational velocity of galaxies at various distances from their center of rotation.
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