Here Saturn’s grey chaos rolls over me, and I obtain dim, shuddering glimpses into those Polar eternities; when wedged bastions of ice pressed hard upon what are now the Tropics; and in all the 25,000 miles of this world’s circumference, not an inhabitable hand’s breadth of land was visible.
There are no more uses of "bastion" in the book.
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These rules are a bastion against corruption.
The universities were the last bastion of freedom, but they were purged of anyone who questioned official propaganda shortly after the coup.