The phrase "two surfaces" is correct and can be used in written English.
It refers to two flat or level areas of an object or space. Example: The table has two surfaces - one for working and one for eating.
So on the two surfaces I believe I could have beaten him, we never played.
One is to screen off the two surfaces from each other.
Rays entering the eye at an oblique angle encounter two surfaces of each mirror box rather than one surface.
The need for two surfaces to bind together and pull apart when desired exists across many fields.
Net radiation exchange between the two surfaces.
One is simply that two surfaces get squashed closer together.
The light-up status ring runs flush between these two surfaces.
Fillet surfaces are created along a common edge of two surfaces or between two surfaces having no common edge.
The friction between two surfaces in contact with each other does slowly increase over time.
In other words, these oxygen bridges can bind the two surfaces together.
The two surfaces also feel the same, which speaks volumes about Logitech's attention to quality with the Ultrathin's construction.
