但如果这区域的形状很特殊，或者密度不均匀，也就是某些部分比较重，那就需要求加权平均值。
But if the region has a strange shape or if a density is not homogeneous, if parts of it are heavier then you will get whatever the weighted average will be.
这种螺旋形状是很特殊的，肯定不会是某种极光现象的变种。
This spiral shape is unique. It is definitely not a variation of the aurora borealis - northern lights.
有一间房内放着盆景，其中有一棵树很特殊，这树的树干形状正像汉字的“寿”。
There is also a room of plants which includes a special bonsai12 tree, the trunk of which happens to be shaped like the Chinese sign meaning long life.
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