...In severe cases the tension due to edema obstructs venous and even arterial flow, in which case bacteria may multiply rapidly in the necrotic tissue and gangrene can occur... 
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...In all directions the bigotryof the churches obstructs amelioration ...
Dr. D.M. Brooks 「The Necessity of Atheism」
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