Definition: Subfloor refers to（适用于） the bottom-most structural floor underneath the decorative or "finish" floor.
Finish flooring, such as ceramic tile, solid wood, laminate（强化地板，复合地板）, engineered wood, and others, all employ subfloor in their construction; after all, they need to rest on something.
In some cases, subfloor is the only layer between the decorative flooring and the joists.
Typically, though, an underlayment--plywood or cement board--rests between the subfloor and the finish floor.
Examples:
The floor installers were forced to put down a layer of quarter-inch（6mm thick） plywood underlayment on the subfloorbefore putting down the Pergo(瑞典柏丽地板 www.pergo.com ).
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References
http://en.wikipedia.org/wiki/Subfloor#Subfloor_construction
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