Simply put, the billions of air cells within the structure of the wood slow down the transfer of heat trying to escape in the winter.
(the billions of air cells within the structure of the wood; slow down; the transfer of heat) Context(the billions of air cells within the structure of the wood slow down,List([12, 80))):(the billions of air cells within the structure of the wood; slow down the transfer of heat trying; to escape in the winter)
the billions of air cells within the structure of the wood slow down,List([12, 80))
the billions of air cells within the structure of the wood the billions of air cells within the structure of the wood
slow down slow down the transfer of heat trying
the transfer of heat
to escape in the winter