美国所谓“能源自主”背后的真相：霍尔木兹海峡仍不可或缺？
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genericClosure implements a worklist algorithm. Give it a starting set of nodes and an operator function. The operator receives each node and returns new nodes to explore. If a key has already been seen, the node gets skipped. The result is every node visited, in discovery order.
Additional BBC coverage concerning South Africa: South African citizens report criminal syndicates capitalizing on water shortages