据了解，国内绝大多数医院在给不孕不育症夫妻做供精人工授精时，医疗机构一般会尽量挑选跟爸爸一样的血型，但每个血型的精源储存数量都是有限的，因此也有部分夫妻申请精子的供精者与男方血型并不相同。而其他信息，
I am working with a large list of points (each point has three dimensions x,y,z). I am pretty new with R, so I would like to know what is the best way to represent that kind of information.As far as
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