double-layered membrane surrounding each lung
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double layered membrane surrounding each lung
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which of these membranes covers the lungs
double layered membrane surrounding each lung, double-layered membrane surrounding each lung, double-folded membrane surrounding each lung, double membrane covering lungs, double membrane which covers the lungs, membrane around each lung, membrane surrounding the lung, the double membrane enclosing the lungs, the inner membrane layer surrounding a lung, membrane covering the lungs, the membrane that surrounds the lungs, the membrane that encloses the lungs, which of these membranes covers the lungs
