Sichtbarkeitf(A property of a replica that indicates which members of the replica set it can synchronize with and which conflict resolution rules apply. Replicas fall into three visibility types: global, local, and anonymous)
visibility The ability of one element to see or refer to another. For one element to send a message to another element, the latter must be visible to the former['vɪzə'bɪlɪtɪ]缩写
