A circle can be defined as the locus of all points that satisfy an equation derived from Trigonometry. Interactive coordinate geometry applet. Includes a cool math ...
http://www.mathopenref.com/coordparamcircle.html
眼楮的顏色是一種由超過一個基因所遺傳的特徵,對人類來說,目前已知3個基因座( Locus)上的基因與眼楮的色彩有關,分別是EYCL1、EYCL2與EYCL3。這些基因 ...
http://zh.wikipedia.org/zh-tw/%E7%9C%BC%E7%9D%9B%E8%89%B2%E5%BD%A9
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