We'll then take a turn to talking about the periodic table, we'll look at a bunch of periodic trends, including ionization energy, electron affinity, electronegativity and atomic radius.
然后我们再开始讲元素周期表，我们会看到很多周期性规律，比如电离能，电子亲和能，电负性以及原子半径。
On special conditions, their projections are circular, these problems turn into the solutions of the circle radius center and tangent.
因为回转体在特殊情况下投影为圆，此类问题就转化为求圆的半径、圆心及切线了。
The acceleration may in turn be obtained from the velocity of the satellite and the radius of the orbit.
这个加速度又可根据卫星的速度和它的轨道半径来求得。
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