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.
首先，对于很多环境而言，大部分应用程序都将需要一个公共的附加权限集。
First, for a large set of environments, most applications will need a common set of additional permissions.
SQS使用基于加权随机分布的消息取样，在查询消息时，它只从取样的一部分服务器返回消息。
SQS USES message sampling based on weighted random distribution, and it returns messages only from the sampled subset of servers when you query for messages.
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