在某些地方，节点有很多与他们邻居的联系，但是网络同时也包含了随机性，而且经常在两个节点间有长距离的连接。
In places, the nodes have many connections with their neighbours, but the network also contains random and often long links between nodes that are very far away from one another.
所以，让我们更进一步，在产生随机数的地方加一个互斥量。
So, let's say we go ahead and add a mutex that surrounds the random number generator.
方法在重点地区采取随机抽样方法选择调查点进行饮水砷测定及地方性砷中毒调查。
Methods The investigated sites were randomly sampled in possible regions where determination of arsenic content in drinking water and survey on endemic arsenic poisoning was carried out.
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